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1
Siddig, Mohammed Hashim. "Optimization of large-scale wind-powered centrifugal pumps." Wind Engineering 43, no. 5 (October 23, 2018): 476–87. http://dx.doi.org/10.1177/0309524x18806656.
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A study on the optimal matching of centrifugal pumps and large-scale wind turbines is reported. The study includes mathematical modelling of the performance of high-capacity centrifugal pumps when matched with efficient high-speed low-solidity wind turbines. The dependence of the performance of wind pumps on the dimensionless parameter v/√( gh), termed the wind pump’s Froude number, was fully analysed. Similar to earlier reported results on wind-powered piston pumps, analysis is showing that the wind pump’s Froude number is the dominant independent dimensionless parameter that fully defines the system’s performance. Operation with continuous variable transmission was analysed and shown to optimize the wind pump’s performance, particularly at medium and low wind speeds. The optimum relation between the required gearbox transmission ratio and Froude number of a wind-powered centrifugal pump was analytically established for three different pumps. In addition to continuous variable transmission operation, the analysis helps in optimally sizing constant transmission ratio systems.
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Hou, Ming Wei. "Optimal Design and Experimental Study on 500SM35 Type Centrifugal Pump." Applied Mechanics and Materials 29-32 (August 2010): 1003–7. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1003.
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To make the high efficiency and energy-saving centrifugal pump, using multi-objective optimization design to make hydraulic design of the 500SM35 centrifugal pumps, using CFD technology to simulate the three-dimensional turbulence flow in pump, also make performance experiment and cavitation experiment of the 500SM35 centrifugal pump that have been self-developed. Experimental studies have shown that: the 500SM35 centrifugal pump’s prototype performance parameters all beyond design specification.
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Mikhaylova, S. V., and I. A. Pogrebnaya. "INCREASING CENTRIFUGAL PUMP PERFORMANCE." Herald of Dagestan State Technical University. Technical Sciences 46, no. 2 (August 28, 2019): 20–27. http://dx.doi.org/10.21822/2073-6185-2019-46-2-20-27.
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Objectives Investigate the prospect of improving the quality of centrifugal pumps in oil production.Method The method is based on energy-efficient installations for high-yield wells - the steps of the Borets-Weatherford installations and the Borets PC stages.Result The main hydraulic characteristics of electric centrifugal pumps with the use of energy-efficient stages with the recommended feed range have been developed. The dependence of the maximum efficiency on the applied steps of the above installations has been determined. A comparative analysis of energy-efficient and commercially available installation of electric centrifugal pumps is given. The dependence of the parameters of the installation steps on the flow, head, number of stages, nominal speed and efficiency of the pump is given.Conclusion When using submersible pumps of the 10ECNM type in oil fields, increased reliability and durability were noted, in contrast to the use of submersible ECNM-type pumps. With the help of energy efficiency programs for oil production, implemented by oil companies, by ensuring more efficient operation of pumping equipment, power consumption has been reduced. The adoption of promising solutions to improve the energy efficiency of ESP systems is a priority. The use of energy-efficient ESP systems for the operation of high-rate and low-rate wells allows to ensure maximum efficiency of the submersible equipment and reduce the specific electricity consumption. In a comparative analysis of the characteristics of pumps with a daily flow of 400 m3, the use of an energyefficient installation ESP 400–2200 with FEA provides three times lower energy costs. A comparative analysis of the energy efficiency of the presented pumps shows that the use of energy-efficient installations of electric centrifugal pumps produced by PC Borets LLC will reduce energy costs by an average of 30%.
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Wang, Xiao Hui, Jun Hu Yang, Feng Xia Shi, and Ren Hui Zhang. "Theoretical and Numerical Study of Performance Prediction of Centrifugal Pumps as Turbines." Applied Mechanics and Materials 444-445 (October 2013): 579–87. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.579.
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Pumps as turbines (PAT) is an attractive alternative for recovering the pressure-energy. Establishing an external characteristic correlation between pumps and turbines is essential in selecting the proper machine. In this study, a theoretical method was presented to predict the performance of PAT at best efficiency point based on pump’s characteristics (geometric and hydraulic). In order to verify the theoretical results, the pumps with specific speed 55, 86,128,180,200 were simulated in direct and reverse modes by FLUENT12.0. Using theoretical and numerical results, the characteristic correlation curves of pumps in direct and reverse modes were obtained. Deviations of theoretical results s in higher flow rate and head than pump mode, the best efficiency of PAT was 2%~6% lower than pump mode.
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Ganushchak, Y., W. van Marken Lichtenbelt, T. van der Nagel, and D. S. de Jong. "Hydrodynamic performance and heat generation by centrifugal pumps." Perfusion 21, no. 6 (November 2006): 373–79. http://dx.doi.org/10.1177/0267659106074003.
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For over a century, centrifugal pumps (CP) have been used in various applications, from large industrial pumps to flow pumps for aquariums. However, the use of CP as blood pumps has a rather short history. Consequently, the hydraulic performance data for a blood CP are limited. The aim of our investigation was to study the hydraulic performance and the heat generation of three commercially available CP: Bio-Medicus Bio-Pump BP80 (Medtronic), Rotaflow (Jostra Medizintechnik), and DeltaStreamTM DP2 (MEDOS Medizintechnik AQ). The study was performed using a circuit primed with a water-glycerin mixture with a dynamic viscosity of 0.00272 pa/s. Pressure-flow curves were obtained by a stepwise stagnation of the pump outlet or inlet. The temperature changes were observed using ThermaCAM SC2000 (Flir Systems). The pumps’ performance in close to clinical conditions (‘operating region’) was analysed in this report. The ‘operating region’ in the case of the BP80 is positioned around the pressure-flow curve at a pump speed of 3000 rpm. In the case of the Rotaflow, the ‘operating region’ was between the pump pressure-flow curves at a speed of 3000 and 4000 rpm, and the DP2 was found between 7000 and 8000 rpm. The standard deviation of mean pressure through the pump was used to characterise the stability of the pump. In experiments with outlet stagnation, the BP80 demonstrated high negative association between flow and pressure variability (r=-0.68, p <0.001). In experiments with the DP2, this association was positive (r=-0.68, pB <0.001). All pumps demonstrated significantly higher variability of pressure in experiments with inlet stagnation in comparison to the experiments with outlet stagnation. The rise of relative temperature in the inlet of a pump was closely related to the flow rate. The heating of fluid was more pronounced in the ‘zero-flow’ mode, especially in experiments with inlet stagnation. In summary, (1) the ‘zero-flow’ regime, which is described in the manuals of some commercially-available pumps, is the use of the pump outside the allowable operating region. It is potentially dangerous and should, therefore, never be used in clinical settings. (2) Using centrifugal pumps for kinetic-assisted venous return can only be performed safely when the negative pressure at the inlet of the pump is monitored continuously. The maximum allowable negative pressure has to be defined for each type of pump, and must be based on pump performance.
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Gandhi, B. K., S. N. Singh, and V. Seshadri. "Performance Characteristics of Centrifugal Slurry Pumps." Journal of Fluids Engineering 123, no. 2 (January 31, 2001): 271–80. http://dx.doi.org/10.1115/1.1366322.
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The performance of two centrifugal slurry pumps has been reported for three solid materials having different particle size distribution (PSD) in terms of head, capacity, and power characteristics. The results have shown that the values of head and efficiency ratios are not only dependent on solid concentration but are also affected by PSD of the solids and properties of the slurry. The addition of fine particles in the slurry of coarser material leads to reduction in the additional losses that occur in the pumps due to the presence of solids. It is also observed that with the increase in the pump size, the additional losses due to presence of solids reduce.
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Choi, Young-Do, Junichi Kurokawa, and Jun Matsui. "Performance and Internal Flow Characteristics of a Very Low Specific Speed Centrifugal Pump." Journal of Fluids Engineering 128, no. 2 (September 5, 2005): 341–49. http://dx.doi.org/10.1115/1.2169815.
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In very low specific speed range (ns<0.25), the efficiency of the centrifugal pump designed by the conventional method becomes remarkably low. Therefore, positive-displacement pumps have been widely used for long. However, the positive-displacement pumps remain associated with problems such as noise and vibration and they require high manufacturing precision. Since the recently used centrifugal pumps are becoming higher in rotational speed and smaller in size, there appear to be many expectations to develop a new centrifugal pump with high performance in the very low specific speed range. The purpose of this study is to investigate the internal flow characteristics and its influence on the performance of a very low specific speed centrifugal pump. The results show that large reverse flow at the semi-open impeller outlet decreases absolute tangential velocity considerably which in turn decreases the pumping head.
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Mrinal, KR, and Abdus Samad. "Performance prediction of kinetic and screw pumps delivering slurry." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 7 (March 22, 2018): 898–911. http://dx.doi.org/10.1177/0957650918760161.
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Transporting slurry is a difficult task and industries use a kinetic or centrifugal pump or a screw or progressive cavity pump to deliver it. On the other hand, approximation models can help predicting performance and avoiding the expensive experiments of pumps with slurries. In this work, bentonite-based slurries were prepared and pumped by a centrifugal pump and a progressive cavity pump. The experimental facilities were developed in-house and artificial neural network-based approximation models were developed to predict performances. The approximation models say that it can eliminate the expensive testing to draw performance curve a pump. The relative merits of the pumps show that the progressive cavity pump has a better capability to handle the slurries or high viscosity fluids.
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Di Giovine, G., L. Mariani, M. Di Bartolomeo, D. Di Battista, R. Cipollone, and A. Carminati. "Comparison on the energy absorbed of volumetric and centrifugal pumps for automotive engine cooling." Journal of Physics: Conference Series 2385, no. 1 (December 1, 2022): 012075. http://dx.doi.org/10.1088/1742-6596/2385/1/012075.
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Abstract Engine thermal management can reduce significantly CO2 emissions in road vehicles without altering sensibly the engine layout. However, more efficient auxiliaries also participate to fuel consumption saving and, therefore, to CO2 emissions reduction. Typically, centrifugal cooling pumps are adopted as circulating devices, but their efficiency varies highly with rotational speed, wasting energy during real operation despite being optimized at the design point. Instead, volumetric pumps keep a high efficiency also far from it, enhancing the overall engine efficiency. In this paper, the performances of a screw-type volumetric pump have been compared with those of a centrifugal pump considering the same cooling circuit of a mid-size engine for passenger vehicles. Both pumps have been designed to satisfy the cooling flow rate required by the engine during a homologation cycle, while verifying their capability to cool the engine operating at maximum power. Once prototyped, the pumps performance maps have been measured, showing a high Best Efficiency Point for both cases. However, the screw pump has better performance in off-design conditions, being the centrifugal pump efficiency strictly dependent on its rotational speed which significantly changes during a real driving. The comparison of the two pumps has been done by reproducing the WLTC on a dynamic test bench. The rotational speed of the volumetric pump has been adjusted to deliver the same flow rate produced by the centrifugal pump as requested by the engine. Results show that the prototyped screw-type volumetric pump absorbs 21% less energy than the prototyped centrifugal pump, reducing CO2 emissions by 0.28 g/km.
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Ali Hikmat Akhmadov, Mehman Omarov, Ali Hikmat Akhmadov, Mehman Omarov. "СOMPARATIVE STUDY OF CENTRIFUGAL PUMP." ETM - Equipment, Technologies, Materials 11, no. 03 (May 23, 2022): 70–74. http://dx.doi.org/10.36962/etm11032022-70.
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In this study, a centrifugal pump was analyzed to examine the effect of the use of inductors on its performance. Tests have been carried out to obtain optimal hydraulic performance before and after using the inductor. We used two types of inductors (axial inductors, screw inductors). For this, a test setup with a pumping system was specially designed to investigate the parameters under consideration. In this study, a simulation of the performance of a centrifugal pump in combination with inductors using CFD is presented for comparison with experimentally observed values. The model explores the effect of using inductors on pump head and flow. The results of the CFD model and experiment correlate well. In addition, the results assist pump decision makers in future developments in pump performance by ensuring that the pumps are in a safe and reliable operating condition. It can also be used for a wide variety of high head and flow pump applications. Keywords: hydraulics, Centrifugal pump, reliability, pumps, devices, system.
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Gavade, Ramesh S., and Suresh M. Sawant. "Study of Mechanical Performance Affecting Factors in Split Casing Pump." International Journal of Engineering and Advanced Technology 10, no. 2 (December 30, 2020): 31–37. http://dx.doi.org/10.35940/ijeat.b1992.1210220.
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The need for better performance and higher comfort continually drive search for new features. In today’s applications, pumps are expected to continue continuously for a long time. So “operational reliability” is a key factor. The comprifugal pump is a fluid-carrying machine, with centrifugal energy produced by rotating air. Pumps are used for conveying fluids. Rotating power usually comes from an electric car, which is turned by the engine and the engine. There is a great demand for centrifugal pumps on the market. The construction is relatively inexpensive, durable and easy, and its high speed makes it possible to connect the pump directly to an unmatched car. The centrifugal pump provides a constant flow of fluid, and can be easily blown without causing damage to the pump. Pump reliability problems address a large amount of repair repairs and the cost of loss of access to chemical plants, refineries, and many electrical appliances. This paper describes the most common causes of pump failure, and how they can be avoided in most cases by using the appropriate types of analysis and procedure during the pump selection process. Specifically, key issues include where the pump will operate next to the best efficient point (BEP). Proper pump selection and installation avoid misalignment. This paper explains the various reasons for the failure of Split break pumps.
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Han, Feng, Xionghuan Chen, Yang Yang, and Chuan Wang. "Numerical and Experimental Study on the Effect of Rotor–Stator Distance on Rotor–Stator Interaction Strength within Mixed-Flow Centrifugal Pumps." Journal of Marine Science and Engineering 10, no. 8 (August 13, 2022): 1114. http://dx.doi.org/10.3390/jmse10081114.
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In this article, the influence of rotor–stator distance on the pump performance and rotor–stator interaction strength within mixed-flow centrifugal pump was investigated based on numerical calculation and test verification. Firstly, the performances of mixed-flow centrifugal pumps with two different rotor–stator distances were obtained and compared with the numerical results, which confirms the high accuracy of the numerical simulation. Next, the performances of mixed-flow centrifugal pumps with five different rotor–stator distances were compared and analyzed. It was found that the hydraulic performance of the mixed-flow centrifugal pump varies slightly as the rotor–stator distance increases. The mean values of the standard deviation of the head and efficiency of the mixed-flow centrifugal pump at each rotor–stator distance under full flow conditions are only 0.16 m and 0.11%, respectively. Then, the strengths of the rotor–stator interaction with different rotor–stator distances were analyzed. It was found that the strengths of the shock interaction, the wake interaction, and the potential interaction were all reduced with increasing rotor–stator distance. Moreover, when the rotor–stator distance is 1.5 mm, the pressure distribution in the circumferential direction of the rotor–stator interference zone shows obvious unstable characteristics: the pressure change amplitude is significantly greater than the other rotor–stator distance of the pressure change amplitude, the maximum and minimum pressure amplitude difference being 56.9 kPa, and with the increase in the rotor–stator distance, the maximum and minimum pressure amplitude difference gradually decreases, with an average value of 32.3 kPa. These findings could provide useful insight into prospects for the improvement of the operational stability of mixed-flow centrifugal pumps, and the results of this study can be extended to all centrifugal pumps using diffusers in the form of vanes as the pressure chamber, which has strong practical application and theoretical value.
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Kazim, K. A., B. Maiti, and P. Chand. "A correlation to predict the performance characteristics of centrifugal pumps handling slurries." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 211, no. 2 (March 1, 1997): 147–57. http://dx.doi.org/10.1243/0957650971537060.
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Centrifugal pumps are being used increasingly for transportation of slurries through pipelines. To design a slurry handling system it is essential to have a knowledge of the effects of suspended solids on the pump performance. A new correlation to predict the head reduction factor for centrifugal pumps handling solids has been developed. This correlation takes into account the individual effect of particle size, particle size distribution, specific gravity and concentration of solids on the centrifugal pump performance characteristics. The range of validity of the correlation has been verified by experiment and by using experimental data available from the literature. The present correlation shows better agreement with the experimental data than existing correlations.
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Si, Qiaorui, Gérard Bois, Minquan Liao, Haoyang Zhang, Qianglei Cui, and Shouqi Yuan. "A Comparative Study on Centrifugal Pump Designs and Two-Phase Flow Characteristic under Inlet Gas Entrainment Conditions." Energies 13, no. 1 (December 21, 2019): 65. http://dx.doi.org/10.3390/en13010065.
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Capability for handling entrained gas is an important design consideration for centrifugal pumps used in petroleum, chemistry, nuclear applications. An experimental evaluation on their two phase performance is presented for two centrifugal pumps working under air-water mixture fluid conditions. The geometries of the two pumps are designed for the same flow rate and shut off head coefficient with the same impeller rotational speed. Overal pump performance and unsteady pressure pulsation information are obtained at different rotational speeds combined with various inlet air void fractions (α0) up to pump stop condition. As seen from the test results, pump 2 is able to deliver up to 10% two-phase mixtures before pump shut-off, whereas pump 1 is limited to 8%. In order to understand the physics of this flow phenomenon, a full three-dimensional unsteady Reynolds Average Navier-Stokes (3D-URANS) calculation using the Euler–Euler inhomogeneous method are carried out to study the two phase flow characteristics of the model pump after corresponding experimental verification. The internal flow characteristics inside the impeller and volute are physically described using the obtained air distribution, velocity streamline, vortex pattern and pressure pulsation results under different flow rates and inlet void fractions. Pump performances would deteriorate during pumping two-phase mixture fluid compared with single flow conditions due to the phase separating effect. Some physical explanation about performance improvements on handing maximum acceptable inlet two phase void fractions capability of centrifugal pumps are given.
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Zhang, Qihua, Weidong Shi, Yan Xu, Xiongfa Gao, Chuan Wang, Weigang Lu, and Dongqi Ma. "A New Proposed Return Guide Vane for Compact Multistage Centrifugal Pumps." International Journal of Rotating Machinery 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/683713.
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For widely used multistage centrifugal pumps, their former structures are so bulky that nowadays growing interest has been shifted to the development of more compact structures. Following this trend, a compact pump structure is provided and analysed. To maintain the pump’s pressure recovery, as well as to meet the water flow from the impeller, a circumferential twisted return guide vane (RGV) is proposed. To validate this design method, the instantaneous CFD simulations are performed to investigate the rotor-stator interventions. Within the impeller, the pressure fluctuation is cyclic symmetry, where the impeller frequency dominates. At the zone where flow leaves impeller for RGV, the pressure fluctuation is nonperiodic, the impeller frequency is major, and the rotation frequency is secondary. Within RGV, the periodic symmetric fluctuation is recovered, where the rotation frequency is governing. The fluctuation decreases from seven cycles within impeller to two cycles within RGV, indicating that the flow from impeller is well handled by RGV. To examine the pump’s performance, a prototype multistage pump is designed. The testing shows that the pump efficiency is 57.5%, and the stage head is 9 m, which is comparable to former multistage centrifugal pumps. And this design is more advantageous in developing compact multistage centrifugal pumps.
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Kim, Hye In, Tae-Seong Roh, Hwanil Huh, and Hyoung Jin Lee. "Development of Ultra-Low Specific Speed Centrifugal Pumps Design Method for Small Liquid Rocket Engines." Aerospace 9, no. 9 (August 28, 2022): 477. http://dx.doi.org/10.3390/aerospace9090477.
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With the growth of the satellite industry, the demand for a propulsion system for small launch vehicles and spacecraft has increased. Small liquid rocket engines may require Ultra-Low specific speed centrifugal pumps due to the low required thrust and volumetric flow rate and high combustion chamber pressure. Therefore, in this study, a design method of Ultra-Low specific speed centrifugal pumps for several hundred Newton class small liquid rocket engines was developed by combining various empirical formulas. In addition, centrifugal pump impellers were designed using the Stepanoff method, which is typically used in pump design, and the circular arc method. The most appropriate method for designing Ultra-Low specific speed centrifugal pumps was determined through a comparative analysis with other methods and validated through CFD. As a result, the pump designed using the proposed method exhibited a performance of pumping and suction superior to the Stepanoff method. Although the number of arcs did not considerably influence the pump performance, the single arc method was confirmed to be the most appropriate design approach in terms of the design productivity and simplicity.
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Zhou, Ling, Wei Dong Shi, Wei Gang Lu, and Hui Li. "Performance Predication and Axial Force Study on Deep-Well Centrifugal Pump." Applied Mechanics and Materials 130-134 (October 2011): 711–14. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.711.
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Axial force is one of the main factors which affect the pump safety and reliability during the operation of pumps, especially in multi-stage centrifugal pumps. 150QJ20 type deep-well centrifugal pump (DCP) is selected as an example to research the pump performance and axial force with the numerical simulation and experiment method. The numerical simulation results were compared with experimental measurements, and such result was analyzed. The results show that the change trend of the pump performance and axial force acquired by numerical and experiment is similar. At rated operating point, the error of axial force between the numerical simulation and experimental measurements is less than 3%. This confirmed the feasibility of predict the pump performance by numerical simulation method.
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Rehman, Atiq Ur, Akshoy Ranjan Paul, and Anuj Jain. "Performance Analysis and Cavitation Prediction of Centrifugal Pump Using Various Working Fluids." Recent Patents on Mechanical Engineering 12, no. 3 (September 26, 2019): 227–39. http://dx.doi.org/10.2174/2212797612666190619161711.
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Background: The application of centrifugal pumps is found in domestic and petrochemical industries. Industrial centrifugal pumps are designed and tested using water as working fluid before supplied to industries, as water is commonly available. However, centrifugal pumps are used in industries for various applications, which involve the handling of fluids other than water- like saline-water, crude oil, gasoline, etc. Consequently, hydraulic performance of the pump differs from the designed and tested values and pump performance becomes unpredictable. Cavitation characteristics of the pump handling different fluids other than water are also changed and many a time, cavitation starts prematurely. As a result, the operating cost of pump is increased. Objective: A CFD based computational analysis of a single-stage, single-entry industrial centrifugal pump having double-volute casing is carried out to compare the performance and cavitation characteristics for various working fluids, namely water, saline water with varying salinity, gasolene and crude oil. Methods: Multiple Reference Frame method (MRF) available in Reynolds-Averaged Navier-Stokes (RANS) equations based CFD solver Ansys-CFX is used in the present study. CFD simulation is carried out for five flow rates with Standard k-ε turbulence model. Rayleigh-Plesset equation describing the growth of a single vapor bubble in a liquid is used for predicting the cavitation flow behaviour. Results: Minimum static pressure is computed at the suction side of saline water as compared to the other working fluids studied here. Hydraulic efficiency of crude oil is found to be the lowest as compared to other fluids. Supercavitation (excessive formation of vapor bubbles and sudden drop in head up to 3%) starts early for saline water with 40g/kg salinity. Conclusion: The results show little variation in pump efficiency when water and saline water are used as working fluids. However, cavitation characteristics differ considerably with the working fluids. Recent patents filed/published in this area revealed that efforts are needed to develop effective cavitationresistant centrifugal impellers and pumps.
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Yang, Yang, Ling Zhou, Hongtao Zhou, Wanning Lv, Jian Wang, Weidong Shi, and Zhaoming He. "Optimal Design of Slit Impeller for Low Specific Speed Centrifugal Pump Based on Orthogonal Test." Journal of Marine Science and Engineering 9, no. 2 (January 26, 2021): 121. http://dx.doi.org/10.3390/jmse9020121.
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Marine centrifugal pumps are mostly used on board ship, for transferring liquid from one point to another. Based on the combination of orthogonal testing and numerical simulation, this paper optimizes the structure of a drainage trough for a typical low-specific speed centrifugal pump, determines the priority of the various geometric factors of the drainage trough on the pump performance, and obtains the optimal impeller drainage trough scheme. The influence of drainage tank structure on the internal flow of a low-specific speed centrifugal pump is also analyzed. First, based on the experimental validation of the initial model, it is determined that the numerical simulation method used in this paper is highly accurate in predicting the performance of low-specific speed centrifugal pumps. Secondly, based on the three factors and four levels of the impeller drainage trough in the orthogonal test, the orthogonal test plan is determined and the orthogonal test results are analyzed. This work found that slit diameter and slit width have a large impact on the performance of low-specific speed centrifugal pumps, while long and short vane lap lengths have less impact. Finally, we compared the internal flow distribution between the initial model and the optimized model, and found that the slit structure could effectively reduce the pressure difference between the suction side and the pressure side of the blade. By weakening the large-scale vortex in the flow path and reducing the hydraulic losses, the drainage trough impellers obtained based on orthogonal tests can significantly improve the hydraulic efficiency of low-specific speed centrifugal pumps.
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Ganushchak, Yuri M., Erik PJ Körver, and Jos G. Maessen. "Is there a “safe” suction pressure in the venous line of extracorporeal circulation system?" Perfusion 35, no. 6 (July 4, 2020): 521–28. http://dx.doi.org/10.1177/0267659120936453.
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Successes of extracorporeal life support increased the use of centrifugal pumps. However, reports of hemolysis call for caution in using these pumps, especially in neonatology and in pediatric intensive care. Cavitation can be a cause of blood damage. The aim of our study was to obtain information about the cavitation conditions and to provide the safest operating range of centrifugal pumps. A series of tests were undertaken to determine the points at which pump performance decreases 3% and gas bubbles start to appear downstream of the pump. Two pumps were tested; pump R with a closed impeller and pump S with a semiopen impeller. The performance tests demonstrated that pump S has an optimal region narrower than pump R and it is shifted to the higher flows. When the pump performance started to decrease, the inlet pressure varies but close to −150 mmHg in the test with low gas content and higher than −100 mmHg in the tests with increased gas content. The same trend was observed at the points of development of massive gas emboli. Importantly, small packages of bubbles downstream of the pump were registered at relatively high inlet pressures. The gaseous cavitation in centrifugal pumps is a phenomenon that appears with decreasing inlet pump pressures. There are a few ways to increase inlet pump pressures: (1) positioning the pump as low as possible in relation to the patient; (2) selecting appropriate sized venous cannulas and their careful positioning; and (3) controlling patient’s volume status.
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Ren, Nai Fei, Ming Min Chen, Jie Jiang, and Li Cheng. "Flow Numerical Simulation of Centrifugal Pump with Splitting Blades Based on RE." Applied Mechanics and Materials 43 (December 2010): 691–94. http://dx.doi.org/10.4028/www.scientific.net/amm.43.691.
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The structure of the centrifugal pump with splitting blades is complex, and the law of the internal flow is not fully grasped. Therefore Reverse Engineering (RE) and numerical simulations of Computational Fluid Dynamics (CFD) are adopted to study the centrifugal pumps with splitter blades. In this process, the law of velocity and pressure distribution of internal flow about the centrifugal pump with splitter blades is preliminary disclosed. In addition, performance prediction was carried out in centrifugal pumps. Comparing to the calculation curve and text characteristic curve, it’s obvious that simulation results are in good agreement with experimental results. The results verify the reliability and feasibility of the research method.
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Sutardi, Sutardi, and Ridwan Adliansyah. "Effect of Impeller Trimming on Centrifugal Pump." Jurnal Rekayasa Mesin 12, no. 3 (December 15, 2021): 663–75. http://dx.doi.org/10.21776/ub.jrm.2021.012.03.16.
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Pumps, especially centrifugal pumps, play an important role in engineering application, such as petroleum and petro-chemical industries, agricultural industries, portland cement industries etc. To obtain the best performance of the pumps, one has to operate the pumps at their design conditions. In some circumstances, however, the pumps must operate lower than their design conditions and result in the decrease in their performances. In such cases, it is possible to replace the pump impeller with the smaller impeller diameter or to cut its original impeller to smaller size as necessary. The cut of the impeller, or it is frequently referred to as impeller trimming, in some extence is preferable than replacing with new impeller or even by replacing with new pump with smaller head and capacity. In this study, we examine the effect of the pump impeller trimming to the pump performaces. The study was performed in the Fluid Mechanics Laboratory, Mechanical Engineering Department of ITS, Surabaya. The pump impellers were cut up to approximately 19 percent of its original pump impeller diameter, where the original pump impeller diameter is 129 mm. The pump has the maximum capacity of 100 liters/min and the total head of 31.5 m. The pump is powered by a 300 Watt electrical motor. Parameters to be studied in this research include pump capacity, pump head, pump power, and pump efficiency. The results of this study show that all data are in good agreement with the pump affinity laws. Pump capacity, pump head, and pump power decresase as the pump impeller diameter decreases. The pump efficiency is, however, in some extent, increases as the pump impeller diameter decreases. The maximum increase in pump efficiency is obtained when the ratio between the trimmed impeller to its original pump impeller diameter is approximately 89 percent (i.e. D2/D1 = 0.89), with the increase in pump efficiency of approximately 20 percent.
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Qazizada, Mohammad, Vladislav Sviatskii, and Pavol Bozek. "ANALYSIS PERFORMANCE CHARACTERISTICS OF CENTRIFUGAL PUMPS." MM Science Journal 2016, no. 04 (September 27, 2016): 1151–59. http://dx.doi.org/10.17973/mmsj.2016_10_201691.
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Patel, Krishna, and Akif Ündar. "Centrifugal Pump Generates Superior Hemodynamic Performance Compared to a new Diagonal Blood Pump in Neonatal and Pediatric ECMO Circuits." World Journal for Pediatric and Congenital Heart Surgery 13, no. 2 (March 2022): 235–41. http://dx.doi.org/10.1177/21501351211057426.
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Purpose With newer generation diagonal and centrifugal blood pumps gaining popularity, the objective of this study was to compare the DP3-i-cor diagonal and RotaFlow centrifugal pumps in terms of hemodynamic performance using simulated neonatal and pediatric extracorporeal membrane oxygenation (ECMO) circuits. Description The DP3-i-cor diagonal pump is a part of the newly FDA-approved NovaLung system. The experimental circuit consisted of either the DP3-i-cor diagonal or RotaFlow centrifugal pump, a polymethylpentene membrane oxygenator, neonatal and pediatric arterial/venous cannulae, and 1/4-inch ID tubing. Three circuits were tested using combinations of either the DP3-i-cor or RotaFlow pump and varying arterial/venous cannulae sizes. Real-time pressure and flow data were collected. Evaluation The new DP3-i-cor diagonal pump exhibited lower flow rate and pressure head when compared to the RotaFlow centrifugal pump at similar rotational speeds and identical experimental conditions. Large-caliber arterial cannulae expectedly generated higher flow rates and pressures. Conclusions The RotaFlow centrifugal pump demonstrated superior hemodynamic performance when compared to the DP3-i-cor diagonal pump in simulated neonatal and pediatric ECMO circuits. Translational research of all ECMO components is crucial.
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Wu, Xinhao, Peilan Su, Jianhua Wu, Yusheng Zhang, and Baohe Wang. "Research on the Relationship between Sediment Concentration and Centrifugal Pump Performance Parameters Based on CFD Mixture Model." Energies 15, no. 19 (October 1, 2022): 7228. http://dx.doi.org/10.3390/en15197228.
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To study the relationship between sediment concentration and the performance parameters of centrifugal pumps, Jiamakou water supply pumping station with total installed capacity of 30,880 kW was selected to analyze characteristics of the centrifugal pump in this paper. Based on a CFD mixture model, the effects of different sediment concentrations on the movement of solid–liquid two-phase flow and the performance parameters of the centrifugal pump were obtained. Then, fitting equations were established between performance parameters (head, flow rate, shaft power, and efficiency) of the centrifugal pump and sediment concentration at three working conditions (0.8 Q = 2 m3/s, Q = 2.5 m3/s, 1.2 Q = 3 m3/s) by the polynomial least-square method. Calculated values of fitting equations were compared with the measured values in centrifugal pump operation. The results show that, as the sediment concentration increases from 0.1% to 1%, the maximum volume fraction of sediment at blade outlet increased from 0.14% to 1.14%, and the maximum volume fraction of sediment at blade outlet increased from 0.7% to 2.29%. The turbulent kinetic energy inside the centrifugal pump increased from 8.74 m2/s2 to 10.78 m2/s2. The calculated values of fitting equation are in good agreement with the measured values in centrifugal pump operation, and the maximum errors of head, flow rate, and efficiency are 6.48%, 3.54%, and 2.87%, respectively. Therefore, the reliability of the fitting equations is verified. The research method can provide a reference for the calculation of performance parameters for centrifugal pumps in other water supply pumping stations with sediment-laden flow.
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Zhang, Hui Min, Guang Ji Li, and Dong Mei Peng. "The Influence of Speed on the Performance of Centrifugal Pump." Applied Mechanics and Materials 249-250 (December 2012): 512–16. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.512.
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Centrifugal pump is widely used in plants as well as in common life. In many conditions, the centrifugal pumps do not operate in their optimal points for various reasons. In order to increase the efficiency, it is often used that the centrifugal pump rotates in different speed. In this paper, the 3D software UG is used to establish the model of pump. The simulation software FLUENT is used to analysis the flow field and pressure in the impeller. The numerical simulation shows that when the speed changed the flow field is similar in the impeller. The performance get from numerical simulation is compared with standard curve.
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Deng, Fanjie, Jianping Yuan, Minquan Liao, Mengfei Chen, Han Zhu, and Qiaorui Si. "Variations of Performance and Pressure Pulsation During Cavitation in Centrifugal Pumps with Entrained Air." E3S Web of Conferences 321 (2021): 04017. http://dx.doi.org/10.1051/e3sconf/202132104017.
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Most of the research on the cavitation with entrained air has focused on the military direction, but it ,about centrifugal pumps, which is relevant to people's livelihood, is still relatively lacking. In order to study the basic law of the development of cavitation inside centrifugal pumps under aeration conditions, a test bench suitable for cavitation experiments with incoming flow containing gas was obtained. Furthermore, a single-stage single-suction 6-blade centrifugal pump was used as the research object to conduct pressure pulsation experiments under cavitation condition when the incoming flow was 1.0% air viod fraction at 2900r/min-50m3/h. The results showed that: After cavitation happened, the greater aeration content will deteriorate the pump's anti-cavitation performance, but the head curve is more gentle in falling down compared to natural cavitation. Hence aeration has a beneficial effect on the performance degradation of the pump under the cavitation condition. At the same time, before the cavitation number drops to the fracture cavitation number of the pump, aeration has improvement in the efficiency of the pump in different degrees , especially in the situation with the ventilated rate of 1.0%. The main frequency of pressure pulsation at the inlet and outlet of the test pump after aeration is dominated by the blade frequency. The shaft frequency signal at the outlet gradually decreases with the cavitation number lessened. Moreover the amplitude of the blade frequency grows slightly with the reduction of the cavitation number. But it tends to soar when the cavitation number is less than the fracture cavitation number.
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Luo, Huican, Peijian Zhou, Lingfeng Shu, Jiegang Mou, Haisheng Zheng, Chenglong Jiang, and Yantian Wang. "Energy Performance Curves Prediction of Centrifugal Pumps Based on Constrained PSO-SVR Model." Energies 15, no. 9 (May 1, 2022): 3309. http://dx.doi.org/10.3390/en15093309.
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It is of great significance to predict the energy performance of centrifugal pumps for the improvement of the pump design. However, the complex internal flow always affects the performance prediction of centrifugal pumps, particularly under low-flow operating conditions. Relying on the data-fitting method, a multi-condition performance prediction method for centrifugal pumps is proposed, where the performance relationship is incorporated into the particle swarm optimization algorithm, and the prediction model is optimized by automatically meeting the performance constraints. Compared with the experimental results, the performance under multiple operating conditions is well predicted by introducing performance constraints with the mean absolute relative error (MARE) for the head, power and efficiency of 0.85%, 1.53%,1.15%, respectively. By comparing the extreme gradient boosting and support vector regression models, the support vector regression is more suitable for the prediction of performance curves. Finally, by introducing performance constraints, the proposed model demonstrates a dramatic decrease in the head, power and efficiency of MARE by 98.64%, 82.06%, and 85.33%, respectively, when compared with the BP neural network.
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Liang, Gao Feng, and Qiang Gao. "Multistage Self-Priming Pump Performance Simulation & Test Research." Applied Mechanics and Materials 651-653 (September 2014): 780–83. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.780.
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Currently the application of traditional centrifugal pump design theory to develop the multi-stage centrifugal pumps is very mature, but the factor of affecting hydraulic performance of centrifugal self-priming pump is still unclear. In this paper, using CFD method to simulate the hydraulic performance of the multistage self-priming pump in different operating conditions, and get the performance prediction curve. The simulation results were compared with experimental data, the result shows that simulation method can accurately predict the performance and internal flow characteristics of multi-stage self-priming pump. The impact on the hydraulic performance by water-keeper chamber and the gas-liquid separation chamber is very limited. The self-priming components can provide a better hydraulic performance. This will be as a reference for the design of self-priming pump.
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Cao, Weidong, Xinyu Yang, and Zhixiang Jia. "Numerical Simulation of Cavitation Flow in a Low Specific-Speed Centrifugal Pump with Different Diameters of Balance Holes." Journal of Marine Science and Engineering 10, no. 5 (May 2, 2022): 619. http://dx.doi.org/10.3390/jmse10050619.
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In order to study the influence of a balance hole’s diameter on the cavitation performance of low specific-speed centrifugal pumps, a centrifugal pump with a specific speed of 0.301 was selected as the research object. The pump’s cavitation performance, distribution of cavitation vapor in the impeller, and axial force on the impeller were studied with the change in diameters of balance holes. The results show that with the increase in the diameter of balance holes, the cavitation number σ3% of the low specific-speed centrifugal pump became small, the pressure in the mechanical seal cavity dropped gradually, and the flow velocity in balance holes was reduced. As cavitation occurred in the impeller, the diameter of balance holes not only affected the absolute value of the axial force but also affected the direction of the axial force.
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Achour, Lila, Mathieu Specklin, Idir Belaidi, and Smaine Kouidri. "Numerical Study of the Performance Loss of A Centrifugal Pump Carrying Emulsion." E3S Web of Conferences 321 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202132101010.
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The performance and hydrodynamic behavior of centrifugal pumps when handling two-phase liquid-liquid flow and emulsion remain relatively unexplored, although they are of fundamental importance in optimizing the operating conditions of these pumps. Hence, this study aims at investigating the performance degradation of a centrifugal pump under emulsion flow by combined means of analytical and computational fluid dynamic (CFD) models. The analytical approach is based on internal energy loss equations while the CFD approach models the emulsion as a continuous and homogeneous single-phase fluid exhibiting shear thinning behavior. The results give a good insight into the performance degradation of such a system, especially at the best efficiency point (BEP).
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Pohan, Adam Hafizar. "PENGUJIAN EKSPERIMENTAL DAN SIMULASI ANSYS PERFORMANSI POMPA SENTRIFUGAL RANGKAIAN SERI DAN PARALEL." Jurnal Sistem Teknik Industri 20, no. 2 (November 5, 2018): 29–35. http://dx.doi.org/10.32734/jsti.v20i2.486.
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This study was conducted to identify the performance of centrifugal pump series configuration and parallel configuration experimentally and Ansys simulation. In the previous study, the performance of centrifugal pumps was calculated by varying the valve opening. In this study researchers varied motor rotation of 1000 rpm, 1200 rpm, 1400 rpm, 1600 rpm and 1800 rpm with open valve 100%. The results show that series configuration has higher head value than parallel configuration. While the parallel configuration has a higher capacity value than the series configuration. The highest pump efficiency for this pump performance test is in series configuration of 1800 rpm is 83.4% for experimental and 85% for simulation. While the lowest pump efficiency is in parallel configuration pumps of 1800 rpm with an efficiency 14.1% for experimental and 15.5% for simulation.
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Jiang, Linglin, Houlin Liu, Yong Wang, Yanhong Mao, Runze Zhou, and Jianbin Gu. "Experimental Study on the Effect of Gas Volume Fraction on the Cavitation Performance of a Low-Specific-Speed Centrifugal Pump." Water 14, no. 5 (March 3, 2022): 798. http://dx.doi.org/10.3390/w14050798.
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In order to study the cavitation performance of centrifugal pumps with low specific speeds under the condition of gas–liquid two-phase flow, a cavitation test rig for pumping gas–liquid two-phase flow was set up. The cavitation performance of the pump with a specific speed of 32 was studied. The variation of the head, pressure pulsation intensity, and vibration intensity with the cavitation allowance NPSHa (Net Positive Suction Head available) of the centrifugal pump were obtained at different inlet gas volume fraction (IGVF) conditions of 0, 1%, 2%, and 3%. The results show that the cavitation performance of a low-specific-speed centrifugal pump can be improved obviously in a certain liquid flow range when the IGVF is 1%, especially at a low liquid flow rate. When cavitation did not occur or the degree of cavitation was low, a lower IGVF can reduce pressure pulsation intensity at the pump outlet and the vibration intensity at the pump inlet under design flow rate and high flow rate conditions. Additionally, all performances of the low-specific-speed pump are more sensitive to gas when the liquid flow rate is low. The results can provide a reference for improving the cavitation performance of low-specific-speed pumps for transporting gas–liquid two-phase flow and single-phase liquids.
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Ansori, Faisal, and Edi Widodo. "Analysis on Centrifugal Pump Performance in Single, Serial, and Parallel." Journal of Energy, Mechanical, Material and Manufacturing Engineering 3, no. 2 (December 31, 2018): 79. http://dx.doi.org/10.22219/jemmme.v3i2.6958.
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The pump is a tool to provide the mechanical energy to the liquid in the pump constant fluid density and large. In terms of mechanism, the pump is divided into three types, namely, rotary pumps, pump the shaft/piston and centrifugal pumps. The use of the pump are the most widely used either in the household or in the environment industry. In the centrifugal pumps, there are losses – losses among other head losses. To find the head losses among other data needs head on the pump, the pump and the discharge flow rate of the pump. Head is defined as energy per unit weight of the fluid. The head of the unit (H) meters or feet is fluid. In the pump, the head is measured by calculating the difference between the total pressure of the suction pipe and the pipe press, when measurement is done at the same height. For single full pump openings 0,00246 m³ \ s, valve openings ¾ 0,00210 and aperture of ½ 0,00177 m³ \ s can be concluded the discharge of water at the pump the larger the opening of the valve the greater the discharge of its water. Moreover, vice versa, if the opening of the valve is getting smaller then the water debit is getting smaller. For full opening valves 3,11 m / s, for openings ¾ 2,65 m / s and ½ 2,23 m / s open valve openings. For the flow, velocity can be concluded the greater the opening of the valve the flow velocity is smaller and vice versa the smaller the opening of the valve the greater the flow rate. single centrifugal pump full valve openings 0.409 kg / cm², the opening of the valve ¾ 0,209 kg / cm² and the opening of the valve ½ 00,069 kg / cm² can be concluded the smaller the opening of the opening valve the smaller the head as well, and the greater the open valve opening, the more big head also in the can.
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Li, Tao, Weiming Zhang, Ming Jiang, and Zhengyang Li. "Experimental Study on Series Operation of Sliding Vane Pump and Centrifugal Pump." International Journal of Rotating Machinery 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/921283.
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A platform for sliding vane pump and centrifugal pump tests is installed to study the series operation of them under different characteristics of pipeline. Firstly, the sliding vane pump and the centrifugal pump work independently, and the performance is recorded. Then, the two types of pumps are combined together, with the sliding vane pump acting as the feeding pump. Comparison is made between the performance of the independently working pump and the performance of series operation pump. Results show that the system flow rate is determined by the sliding vane pump. In order to ensure the stability of the series operation pumping system, the energy consumption required by the pipeline under the system flow should be greater than the pressure energy centrifugal pump can generate. Otherwise, the centrifugal pump can not operate stably, with reflux, swirl, gas-liquid two-phase flow in the runner and strong vibration and noise. The sliding vane pump can be in serial operation with the centrifugal pump under limited conditions.
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Ke, Qidi, and Lingfeng Tang. "Performance Optimization of Slotted Blades for Low-Specific Speed Centrifugal Pumps." Advances in Civil Engineering 2023 (January 5, 2023): 1–16. http://dx.doi.org/10.1155/2023/9612947.
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Centrifugal pumps are widely used for the transport of fluids, but low-specific-speed centrifugal pumps widely have problems with serious backflow and low efficiency. In this paper, a low-specific-speed centrifugal pump with a specific speed of 55 is used as a research object. By combining numerical simulation and orthogonal experiment, the pressure distribution and velocity distribution of the flow channel are analyzed, the priority of each geometric factor for slits on pump performance is determined, the geometric parameter structure of the slotted blade is optimized by entropy weight on TOPSIS, the optimal impeller slit solution is obtained. The results show that with a balance of head and efficiency, the order of influence of the factors is: slit center width b > diameter of slit D > shrinkage ratio of slit f > depth of slit h > deflection angle of slit β . The optimal combination of slit geometry parameters is: slit center width is 3 m m , diameter of the slit is 200 m m , shrinkage ratio of the slit is 0.5, depth of the slit is 6 m m , and the deflection angle of the slit is 20°. Through ANSYS FLUENT simulation and experiment of closed pump experiment system, confirmed that hydraulic performance is improved.
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Wang, Yuqin, Jian Luo, Shuai Liu, Zhibo Han, and Xiaoqiang Ni. "Hydraulic optimization design of centrifugal pumps aiming at low vibration noise." AIP Advances 12, no. 9 (September 1, 2022): 095026. http://dx.doi.org/10.1063/5.0111256.
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In order to reduce the vibration noise generated by the centrifugal pump in the working process and improve the working efficiency of the centrifugal pump, the sound field numerical calculation of IS80-65-160 single-stage single-suction centrifugal pump was carried out. Under the condition that the parameters of the pump body and the impeller remain unchanged, the number of blades of the prototype pump impeller was designed as 4, 5, 6, and 7, respectively. The flow-induced vibration and noise characteristics of centrifugal pumps were studied from two aspects of numerical simulation and test, and the renormalization group k-ε model was used to simulate the steady and unsteady state of centrifugal pumps with different blade numbers. The external characteristics, pressure pulsation characteristics, vibration, and noise of the centrifugal pump were obtained, and the flow-induced vibration and noise test platform of the centrifugal pump was built for experimental verification. The research showed that the flow induction in the model pump was the main factor affecting the vibration of the prototype pump, and the shaft frequency and blade frequency were the main reasons causing the noise of the prototype pump. The vibration of each blade was the most concentrated at onefold blade frequency, and the peak of the sound field acoustic pressure level of the pump body was higher than other frequencies at threefold blade frequency, which was most obvious in the tongue region of the volute. With the increase of blades, the noise in volute decreased. The vibration intensity of the 4-blade prototype pump was lower, but the efficiency and head were also lower. The vibration intensity of the 5-blade prototype pump was the highest, the comprehensive performance of the 6-blade prototype pump was better, and the vibration of the 7-blade prototype pump was unstable. The test results showed that six blades could effectively reduce the flow-induced vibration noise of centrifugal pumps and improve the working environment, which provided certain application value and guiding significance for the hydraulic design of the subsequent low-noise centrifugal pumps.
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Jiang, Qifeng, Yaguang Heng, Xiaobing Liu, Weibin Zhang, Gérard Bois, and Qiaorui Si. "A Review of Design Considerations of Centrifugal Pump Capability for Handling Inlet Gas-Liquid Two-Phase Flows." Energies 12, no. 6 (March 20, 2019): 1078. http://dx.doi.org/10.3390/en12061078.
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Most of the pumps working under two phase flows conditions are used in petroleum industry applications, like electrical submersible pumps (ESP) for hydrocarbon fluids, in chemistry, nuclear industries and in agriculture for irrigation purposes as well. Two-phase flows always deteriorate overall pump performances compared with single flow conditions. Several papers have been published aiming to understand flow physics and to model all the main mechanisms that govern gas pocket formation and surging phenomena. These mechanisms depend on the pump type, the impeller geometry, the rotational speed, design and off-design liquid flow rate conditions, the volumetric gas fraction, the fluid properties and the inlet pressure. In the present paper, a review on two phase performances from various centrifugal pumps designs is presented, mainly based on experimental results. The main focus is devoted to detect the significant geometrical parameters that: (1) Modify the pump head degradation level under bubbly flow regime assumption; (2) Allow single stage centrifugal pumps keep working under two-phase flow conditions with high inlet void fraction values before pump shut down, whatever the pump performance degradations and liquid production rates should be. Because most of the published experimental studies are performed on dedicated laboratory centrifugal pump models, most of the present review is based on air-water mixtures as the working fluid with inlet pressures close to atmospheric conditions. The following review supposes that gas phase is considered as a non-condensable perfect gas, while the liquid phase is incompressible. Both phases are isolated from external conditions: neither mass nor heat transfer take place between the phases.
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Gahlot, V. K., V. Seshadri, and R. C. Malhotra. "Effect of Density, Size Distribution, and Concentration of Solid on the Characteristics of Centrifugal Pumps." Journal of Fluids Engineering 114, no. 3 (September 1, 1992): 386–89. http://dx.doi.org/10.1115/1.2910042.
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Experimental data on the performance of the centrifugal pumps pumping mixtures of solids and water have been presented. The solids used were coal of density 1480 kg/m3 and zinc tailings of density 2850 kg/m3. Maximum size of particles was approximately 3 mm. Tests have been conducted with a rubber lined impeller pump and a metal impeller pump. Effects of solid properties (viz: density, size, and size distribution as well as concentration of solids) on the performance of the pumps have been studied. The measured performance of pumps is compared with the predictions based on the correlations available in literature and a modified empirical relationship has been proposed for the prediction of the pump performance with slurries.
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He, Peng Cheng, and Peng Yun Song. "A Simple Correlation Equation to Predict Pump Performance for Slurry." Applied Mechanics and Materials 365-366 (August 2013): 365–69. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.365.
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As to the centrifugal pump for slurry, the effects of solids particles on the performance of the pump have been extensively researched. It is essential to understand the effects of solids on the pump performance well in order to obtain the performance of centrifugal pump for handling slurries. Some existing correlation equations to predict the performance are analyzed and summarized in this paper. A new simple correlation equation to predict the head ratio for pumps handling solids has been developed. The simple equation has been validated by the experiment data published in the related literature. The results by the simple equation are compared with ones available in the literature. The result shows that the simple equation is in good agreement with the experimental data, and it can be used to predict the performance of centrifugal pump for slurry.
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Zhang, Li, Hui Li, Hong Xu, Weidong Shi, Yang Yang, Wanhong Wang, and Ling Zhou. "Experimental and Numerical Investigation of Pressure Fluctuation in a Low-Specific-Speed Centrifugal Pump with a Gap Drainage Impeller." Shock and Vibration 2021 (June 30, 2021): 1–14. http://dx.doi.org/10.1155/2021/5571178.
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In order to analyze the effect of impeller with different slot widths on the performance of the low-specific-speed centrifugal pumps, based on the impeller of a single-stage pump with the specific speed of 21, two gap drainage schemes with slot widths of 1.5 mm and 6.0 mm, slot diameter of 180 mm, and lap length of 5 mm were designed. Both experimental and numerical simulation methods were applied to compare the steady performance, which includes the head, efficiency, and the internal flow field distribution, and the unsteady pressure pulsation performance between new designed pumps and the original pump. The results show that gap drainage would cause a certain degree of head reduction, but a smaller slot width could achieve higher efficiency. Meanwhile, a reasonable open seam scheme can reduce the development of pressure pulsation, which provides experience and reference for the stable operation of low-specific-speed centrifugal pumps.
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Li, Jia, Xin Wang, Yue Wang, Wancheng Wang, Baibing Chen, and Xiaolong Chen. "Effects of a Combination Impeller on the Flow Field and External Performance of an Aero-Fuel Centrifugal Pump." Energies 13, no. 4 (February 18, 2020): 919. http://dx.doi.org/10.3390/en13040919.
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Aero-fuel centrifugal pumps are important power plants in aero-engines. Unlike most of the existing centrifugal pumps, a combination impeller is integrated with the pump to improve performance. First, the critical geometrical parameters of the combination impeller and volute are given. Then, the effects of the combination impeller on the flow characteristics of the impeller and volute are clarified by comparing simulation results with that of the conventional impeller, where the effectiveness of the selected numerical method is validated by an acceptable agreement between simulation and experiment. Finally, the experiment is set to test the external performance of the studied pump. A significant feature of this study is that the flow characteristics are significantly ameliorated by reducing the flow losses that emerged in the impeller inlet, impeller outlet, and volute tongue. Correspondingly, the head and efficiency of a combination impeller are higher with comparison to a conventional impeller. Consequently, it is a promising approach in ameliorating the flow field and improving external performance by applying a combination impeller to an aero-fuel centrifugal pump.
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Idris, Muhammad Nuru. "Design Studies Using Corrosive and Non-Corrosive Materials to Improve on Reliability and Efficiency of an Impeller of a Centrifugal Pump." ECS Meeting Abstracts MA2022-02, no. 64 (October 9, 2022): 2345. http://dx.doi.org/10.1149/ma2022-02642345mtgabs.
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Design Studies using Corrosive and Non-corrosive Materials to Improve on Reliability and Efficiency of an Impeller of a Centrifugal Pump N. Idris*1, 3and I. U. Umaru2 1Department of Chemical Engineering University of Maiduguri Borno State, Nigeria Email: idrismn@unimaid.edu.ng ABSTRACT The quest to improve on the reliability, operability, sustainability of centrifugal pumps in all facets of process operations, oil and gas industries across the globe have a pivoted role to play in the development of world energy technology and sustainability in numerous ways. This is because several operability challenges and malfunctioning of centrifugal pumps can usually results to unexpected shutdown of process operations and mostly in cases with faulty standbys. Centrifugal pump is a type of a turbo machine in which mechanical energy is converted into pressure energy by means of centrifugal force acting on the fluid. The impeller is the revolving component of the centrifugal pump that transmits energy from the electric motor that drives the pump to the fluid being pumped by acceleration of the fluid outwards from the centre of rotation. Several researches have been conducted using experiment and numerical simulations to design the centrifugal pump impellers. As a result of recent research, the performance of contemporary centrifugal pump impellers yielded positive results. However, for sustainability there is a need to design the impellers using corrosive and non-corrosive materials to improve on its reliability and efficiency of the pump. The aim and objective of the studies are: to analyze the pressure, head and efficiency of the designed centrifugal pump impeller, to improve on the efficiency and reliability of a centrifugal pump impeller by changing the blade angle and the use of corrosive and non-corrosive fluids, experimental measurements to analyze the pressure fluctuation performance of a centrifugal pump impeller using CFD. Keywords: Oil and gas, centrifugal pump, reliability, sustainability Correspondence about this article: Please for all correspondence on this article, kindly contact the principal author as stated above. Thank you.
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Zhang, Jianyi, Hao Yang, Haibing Liu, Liang Xu, and Yuwei Lv. "Pressure Fluctuation Characteristics of High-Speed Centrifugal Pump with Enlarged Flow Design." Processes 9, no. 12 (December 15, 2021): 2261. http://dx.doi.org/10.3390/pr9122261.
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The pressure fluctuations of high-speed centrifugal pumps are the hotspot in pump research. Pressure fluctuations is differ for different structural designs and flow structures. High-speed centrifugal pumps are usually designed to increase efficiency with an enlarged flow design at a low specific speed, which changes the structure of the pump. In order to analyze the pressure fluctuations of a high-speed centrifugal pump with an enlarged flow design, the pressure was measured, and the flow field of the pump was simulated with different flow rates. Through analysis, we found that pressure fluctuations varied periodically and was consistent with the blade frequency. The pressure fluctuations at the guide vane and the interference region were also closely related to the vortices at the impeller outlet, which changed differently at different flow rates. The results showed that the high-speed centrifugal pump with an enlarged design had better performance at a large flow rate. The results in this paper can provide reference for the design of a pump that should be designed with the enlarged flow method.
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Yuan, Jianping, Jiali Shi, Yanxia Fu, Huilong Chen, Rong Lu, and Xueliang Hou. "Analysis of Fluid-Structure Coupling Dynamic Characteristics of Centrifugal Pump Rotor System." Energies 15, no. 6 (March 15, 2022): 2133. http://dx.doi.org/10.3390/en15062133.
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Safety and reliable operation is one of the most important research areas for centrifugal pump systems, due to the interaction of complex flow, large structural load, and vibration caused by the operation of the impeller. To analyze the internal flow and impeller deformation of the centrifugal pump, the single-stage single-suction centrifugal pump titled IS100-80-160 was selected as the research object. Under the principle of single variable, the turbulent flow and structural response of three impellers designed by different parameters were calculated by CFX and ANSYS Workbench. A numerical simulation of steady flow at different flow rates of the centrifugal pump was carried out, and its hydraulic performance is consistent with the corresponding experimental results. By comparing the deformation of the impeller rotor system, it was found that the closed impeller has the worst stability with the best hydraulic performance; the impeller with split blades has the worst stability with the best hydraulic performance. This study could enhance the understanding of impeller FSI on centrifugal pump stability and provide a reference for improving the operational stability of centrifugal pumps.
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Williams, A. A. "The Turbine Performance of Centrifugal Pumps: A Comparison of Prediction Methods." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 208, no. 1 (February 1994): 59–66. http://dx.doi.org/10.1243/pime_proc_1994_208_009_02.
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Standard centrifugal Dumps may be operated in reverse as water turbines, and for hydroelectric plums of less than 100 kW (micro- hydro) they are often cheaper than specifically designed turbines. However, in order to use a pump in a micro-hydro scheme, the turbine performance-must be found either by testing or by calculation. Several methods have been suggested for predicting the turbine performance based on the data for pump performance at best efficiency, but they produce a wide range of results. In this paper, eight such methods are compared using an analysis of the effects of poor turbine prediction on the operation of a pump as turbine at a typical micro hydro site. The comparison uses the results of turbine tests on 35 pumps of various types and sizes, some of which have come from the author's own tests. None of the eight methods gives an accurate prediction for all of the pumps but one of the methods can be recommended as a first estimate of the turbine performance.
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Noghrehkar, G. R., M. Kawaji, A. M. C. Chan, H. Nakamura, and Y. Kukita. "Investigation of Centrifugal Pump Performance Under Two-Phase Flow Conditions." Journal of Fluids Engineering 117, no. 1 (March 1, 1995): 129–37. http://dx.doi.org/10.1115/1.2816802.
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A one-dimensional two-fluid model has been used to study the centrifugal pump head degradation phenomena and to analyze the gas-liquid interaction within the pump impeller under high pressure, steam-water two-phase flow conditions. The analytical model was used to predict the two-phase pump head data for the small-scale and full-scale nuclear reactor pumps and the predictions of the head degradation compared favorably with the test data for different suction void fractions. The physical mechanisms responsible for head degradation were also investigated.
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Hu, Bo, Shou Qi Yuan, Wei Gang Lu, Jian Ping Yuan, and Lei Li. "Optimal Design of a Non-Overload Centrifugal Pump." Advanced Materials Research 468-471 (February 2012): 2357–63. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.2357.
Full textAbstract:
Three experiment factors including outlet blade angle β2, b2 and impeller wrapping angle θ are selected for optimal design of a non-overload pump. Numerical simulation with CFD is employed to reduce the cost and shorten the design period. The time-averaged Navier-Stokes equations of 3D steady flow in the pump are calculated by CFD based on the SST k-ω turbulence model and standard wall function. The structured grids of different qualities are used in one scheme for comparison to confirm that the results are not influenced by the quality of mesh. The optimal scheme is obtained when β2, b2, θ are 20 degrees, 7mm, 170 degrees, respectively. Its pressure head is 89.75m achieving the pump efficiency of 57% at maximum. The performances of NCPs at other working conditions satisfy the requirement of heads and efficiencies from China National Standard. The shaft power reaches to 15kW at 1.5QR (35.5m3/h), showing that the non-overload performance is also significantly improved. The impeller is considered as the optimal scheme and produced for experiments. Experiment data prove that it is effective and reliable to improve a non-overload pump’s performance by maximum flow design method and non-overload pump design method. The results provide a reference for increasing the efficiencies and pressure heads of non-overload pumps at multiple operating conditions.
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Wang, Yanping, Tielin He, Qiangmin Ding, Panlong Gao, Ruilin Tao, and Zuchao Zhu. "Analysis of Internal Flow and Wear Characteristics of Binary Mixture Particles in Centrifugal Pump Based on CFD-DEM." Processes 10, no. 4 (March 31, 2022): 681. http://dx.doi.org/10.3390/pr10040681.
Full textAbstract:
Solid-liquid two-phase flow centrifugal pumps are widely used in many fields closely related to economic development, such as energy exploitation, and the petrochemical industry. Many scholars have studied the influence of solid particles with different parameters on the transportation performance of centrifugal pumps but have mainly focused on the study of low-concentration single-component particles, and the research on the transportation of high-concentration binary mixture particles in centrifugal pumps is insufficient. In this paper, two kinds of glass beads (0.4 mm and 2 mm) were mixed as a solid phase medium, representing small particles and large particles, respectively. The effects of a high concentration (Cv = 10%) of binary mixture particles on the transport and wear characteristics of a solid-liquid centrifugal pump were analyzed by simulation and experiment. Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) and Archard wear model were used for simulation, realized by Fluent software and EDEM software. The results show that the large particles have a greater effect on the performance decline than the small particles, and the increase of the proportion of large particles has a greater effect on the efficiency decline than the head decline. The wear degree of the flow channel in the pump changes obviously with the particle ratio, and the overall wear is small when the particle ratio is 1:2.
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Khoeini, D., E. Shirani, and M. Joghataei. "Improvement of Centrifugal Pump Performance by Using Different Impeller Diffuser Angles with and Without Vanes." Journal of Mechanics 35, no. 4 (August 28, 2018): 577–89. http://dx.doi.org/10.1017/jmech.2018.39.
Full textAbstract:
ABSTRACTThis study aims at improving the performance of a centrifugal pump by using different angular diffusers on the downstream side of the centrifugal pump impeller. Numerical and experimental studies have been carried out on different vaned and non-vaned diffuser with three different wall divergence angle (α) of 0°, 5° and 10° to achieve that purpose. The data analyses show good agreement between the numerical and experimental results. They reveal profound effect of the divergence angle (α) of angular vaned diffuser on the head and overall efficiency of centrifugal pumps especially at high flow rates as they broaden operating region of the centrifugal pump. In fact it is found that the head and overall efficiency of impeller with vaned diffuser α = 10° enhance by 15.4 and 9 percent respectively compared to that of centrifugal pump with no vaned diffuser at high flow rates. Furthermore the head and overall efficiency of impeller with vaned diffuser α = 10° increase by 5.7 and 7 percent respectively in comparison with the impeller with vaned diffuser α = 0°.