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1
Shi, Lian. "Application of Technology in the Fault Diagnosis of Large Centrifugal Pump Units". Journal of Electronic Research and Application 6, n.º 2 (13 de abril de 2022): 26–31. http://dx.doi.org/10.26689/jera.v6i2.3856.
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In order to promote the stability of centrifugal pump units and maximize the role of centrifugal pumps, this paper analyzes the composition and basic working principle of centrifugal pumps, presents the main concerns of centrifugal pump maintenance, and finally investigates the common faults and maintenance methods of centrifugal pumps for reference.
2
Bogdevičius, Paulius, Olegas Prentkovskis e Marijonas Bogdevičius. "Transmission with Cardan Joint Parametre Influence to Centrifugal Pump Characteristics". Mokslas - Lietuvos ateitis 9, n.º 5 (27 de dezembro de 2017): 559–64. http://dx.doi.org/10.3846/mla.2017.1073.
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Transmission with cardan joints and nonlinear gearbox elements generates vibrations caused by spinning motion of transmission. This affects the pressure and productivity of centrifugal pump. The momentum of centrifugal pump in turn affects dynamic characteristics of transmission. In order to find the effect of transmission elements on centrifugal pump we investigate transmission composed of asynchronous electrical engine, gear box, cardan joint and Ziegler Ultra centrifugal pump. We create mathematical models of transmission and centrifugal pumps and investigate how the dynamic effects of transmission influence productivity centrifugal pump. This model can be applied to study the transmission parameters, effect of intake and outflow parameters on productivity of centrifugal pump and presence of cavitation. The paper includes results and conclusions of mathematical model.
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Wang, Yuqin, Jian Luo, Shuai Liu, Zhibo Han e Xiaoqiang Ni. "Hydraulic optimization design of centrifugal pumps aiming at low vibration noise". AIP Advances 12, n.º 9 (1 de setembro de 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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Ali Hikmat Akhmadov, Mehman Omarov, Ali Hikmat Akhmadov, Mehman Omarov. "СOMPARATIVE STUDY OF CENTRIFUGAL PUMP". ETM - Equipment, Technologies, Materials 11, n.º 03 (23 de maio de 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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Pongsapan, Allo Sarira, e Rombe Allo. "ANALISIS UNJUK KERJA POMPA SENTRIFUGAL DENGAN PEMASANGAN INDUCER PADA LOCK NUT IMPELLER". Jurnal Teknik AMATA 3, n.º 2 (3 de dezembro de 2022): 17–25. http://dx.doi.org/10.55334/jtam.v3i2.298.
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Centrifugal pumps are the most widely used fluid machines in our daily life. In operation there are many losses caused by the installation and construction of the pump itself. Many studies have been carried out to minimize these losses, including the research we did, namely in the form of modifications to the centrifugal pump inlet. This study aims to determine the effect of installing the inducer on the locknut impeller on the characteristics of a radial flow type centrifugal pump. Here what is meant by pump characteristics are head, discharge, and pump efficiency. The method used is experimental. The activities carried out in this study included: designing and assembling simple pump testing equipment, making specimens, collecting data, analyzing and discussing and concluding. In this study there were four types of tests, namely: 1) Centrifugal pump without modification (normal); 2) Pump of the 1st modification with inducer, 25 mm long; 3) Pump of the 2nd modification with inducer, length 50 mm; and 4) Pump modification 3rd with inducer, length 75 mm. Research shows that modifications can improve the characteristics of centrifugal pumps which are the object of research where there is an increase in total head (Htot), discharge (Q) and efficiency (ηp). The best characteristics were obtained from the 2nd modification pump with an inducer length of 50 mm, followed by the 3rd modification pump with an inducer length of 75 mm, the 1st modification pump with an inducer length of 25 mm and the lowest was the pump without modification (normal). Characteristics of centrifugal pumps This increase is due to modifications that minimize pre-rotation symptoms, turbulence, and flow separation. Or in other words, the modification causes an improvement in the flow pattern at the inlet of the centrifugal pump.
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Li, Tao, Weiming Zhang, Ming Jiang e 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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Sutardi, Sutardi, e Ridwan Adliansyah. "Effect of Impeller Trimming on Centrifugal Pump". Jurnal Rekayasa Mesin 12, n.º 3 (15 de dezembro de 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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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, n.º 64 (9 de outubro de 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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Handayani, Sri Utami. "KARAKTERISTIK POMPA SENTRIFUGAL ALIRAN CAMPUR DENGAN VARIABLE FREQUENCY DRIVE". ROTASI 15, n.º 3 (19 de dezembro de 2013): 30. http://dx.doi.org/10.14710/rotasi.15.3.30-34.
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In an industry that uses large centrifugal pumps continuously, pump speed setting can reduce energy consumption significantly. By changing the speed of a centrifugal pump, capacity, head, and pump power required will change according to pump affinity laws. Speed of a centrifugal pump can be changed by variable frequency drive . This study aimed to investigate the characteristics of mixed flow centrifugal pumps with variable frequency drive. The results showed that 10% of maximum speed reduction can decrease power consumtion until 50%, while the increase in the efficiency is maximum 7.2%. The power reduction is different for different speed reduction. In a dynamic head dominated system the efficiency will remain constant during speed reduction while in static head dominated system will change.
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Hou, Ming Wei. "Optimal Design and Experimental Study on 500SM35 Type Centrifugal Pump". Applied Mechanics and Materials 29-32 (agosto de 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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Wang, Yuqin, Haodong Zhang, Zhibo Han e Xiaoqiang Ni. "Optimization Design of Centrifugal Pump Flow Control System Based on Adaptive Control". Processes 9, n.º 9 (29 de agosto de 2021): 1538. http://dx.doi.org/10.3390/pr9091538.
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In this paper, in order to improve the control characteristics of the centrifugal pump flow control system, a mathematical model of the centrifugal pump flow control system was established based on an analysis of the basic structures, such as the frequency converter, motor, and centrifugal pump. Based on the adaptive control theory, the recursive least squares algorithm with a forgetting factor was used to estimate the real-time parameters of the centrifugal pump control system, and the self-tuning PID control method was used to optimize the mathematical model of the centrifugal pump flow control system. The simulation results showed that the adjustment time of the optimized system was shortened by 16.58%, and the maximum overshoot was reduced by 83.90%, which improved the rapidity and stability of the transient response of the system. This showed that adaptive control had a significant effect on improving the robustness and anti-interference ability of the centrifugal pump control system. In order to further verify the accuracy of the self-tuning PID control method, a flow adaptive control system test platform was built. The test results showed that under the conditions of constant frequency and variable frequency, the actual flow rate of the centrifugal pump was always kept near the set flow rate, the error was small, and it had better real-time followability. The research results showed that adaptive control could revise the parameters in real-time according to changes to the centrifugal pump control system, which improved the stability and robustness of the system. Therefore, adaptive PID control could effectively improve the adaptability of centrifugal pumps to various complex working conditions and improve the working efficiency of centrifugal pumps.
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AA, Gareev. "Salt Deposition in Electric Submersible Centrifugal Pumps under Intermittent Operation". Petroleum & Petrochemical Engineering Journal 5, n.º 2 (2021): 1–6. http://dx.doi.org/10.23880/ppej-16000267.
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“Salt deposition in a centrifugal pump under intermittent operation” is the first article to address the cause of failures among electric submersible centrifugal pumps operating intermittently. The causes of said failures are analyzed. The failure of electric submersible centrifugal pumps is caused by their temperature behavior during operation. The problem of the thermal condition of a centrifugal pump under intermittent operation must be solved. Moreover, the number of failures caused by salt deposition or the electric resistance drop of the “cable – motor” system can be reduced.
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Chen, YunFei, Jianping Yuan, Yin Luo e Wenqi Zhang. "Fault Prediction of Centrifugal Pump Based on Improved KNN". Shock and Vibration 2021 (21 de outubro de 2021): 1–12. http://dx.doi.org/10.1155/2021/7306131.
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To effectively predict the faults of centrifugal pumps, the idea of machine learning k-nearest neighbor algorithm (KNN) was introduced into the traditional Mahalanobis distance fault discrimination, and an improved centrifugal pump fault prediction model of KNN based on the Mahalanobis distance is proposed. In this method, the Mahalanobis distance is used to replace the distance function in the conventional KNN algorithm. Grid search and cross-validation are used to determine the optimal K value of the prediction model. A centrifugal pump test rig was established to solve three common faults of centrifugal pumps: cavitation, impeller damage, and machine seal damage, and the method was verified. The results show that this method can effectively distinguish the specific fault types of centrifugal pumps based on vibration signals, and the fault prediction accuracy of the off-balance condition is up to 82%. This study provides a novel idea and method for centrifugal pump fault prediction and diagnosis and avoids the interaction between parameters when monitoring multiple parameters.
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Patel, Krishna, e 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, n.º 2 (março de 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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Di Giovine, G., L. Mariani, M. Di Bartolomeo, D. Di Battista, R. Cipollone e A. Carminati. "Comparison on the energy absorbed of volumetric and centrifugal pumps for automotive engine cooling". Journal of Physics: Conference Series 2385, n.º 1 (1 de dezembro de 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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Gabbasov1, Bulat M. "Investigating external and internal working processes of mining machines when operating on “unclarified” water in underground conditions". Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal 6 (15 de setembro de 2021): 13–23. http://dx.doi.org/10.21440/0536-1028-2021-6-13-23.
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Introduction. The article considers the issues of mine drainage study, including the working processes of the centrifugal pumps pumping “unclarified” water in arduous underground conditions. Such problems resolution is of high practical and scientific importance. Methods of research. Scientific and practical experience in the field of mine drainage was analyzed and generalized. The centrifugal pump modes were considered and promising research tasks in this field were outlined. Thus, the continuous income of groundwater to mine workings requires the uninterrupted operation of pumps. One of the most common types of mine-drainage plants is a multistage centrifugal pump which fulfills its functions to the full if properly operated. However, “unclarified” water pumping requires a new technique for centrifugal pump optimal modes determination in such service conditions. Result and analysis. The study of hydraulic, volumetric, and mechanical efficiency dependency on pump modes, the analysis of working processes within centrifugal pumps when operating on “unclarified” water, and the procedure and calculation of TsNS (multistage centrifugal pump) head-capacity curve were presented in the paper to justify the effectiveness of the presented solutions and conclusions. Scope of results. It is recommended that the research results are introduced in all enterprises conducting underground mining operations with the mine drainage.
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Gabbasov1, Bulat M. "Investigating external and internal working processes of mining machines when operating on “unclarified” water in underground conditions". Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal 6 (15 de setembro de 2021): 13–23. http://dx.doi.org/10.21440/0536-1028-2021-6-13-23.
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Introduction. The article considers the issues of mine drainage study, including the working processes of the centrifugal pumps pumping “unclarified” water in arduous underground conditions. Such problems resolution is of high practical and scientific importance. Methods of research. Scientific and practical experience in the field of mine drainage was analyzed and generalized. The centrifugal pump modes were considered and promising research tasks in this field were outlined. Thus, the continuous income of groundwater to mine workings requires the uninterrupted operation of pumps. One of the most common types of mine-drainage plants is a multistage centrifugal pump which fulfills its functions to the full if properly operated. However, “unclarified” water pumping requires a new technique for centrifugal pump optimal modes determination in such service conditions. Result and analysis. The study of hydraulic, volumetric, and mechanical efficiency dependency on pump modes, the analysis of working processes within centrifugal pumps when operating on “unclarified” water, and the procedure and calculation of TsNS (multistage centrifugal pump) head-capacity curve were presented in the paper to justify the effectiveness of the presented solutions and conclusions. Scope of results. It is recommended that the research results are introduced in all enterprises conducting underground mining operations with the mine drainage.
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АА Gareyev. "Contemporary issues of well operation using centrifugal pumps". Global Journal of Engineering and Technology Advances 13, n.º 1 (30 de outubro de 2022): 053–58. http://dx.doi.org/10.30574/gjeta.2022.13.1.0171.
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This paper opens a new page in the theory of electric-centrifugal pump control and oil production. Emerging ideas give us the opportunity to predict the state of a centrifugal pump during operation, facilitate a new approach to the centrifugal-pump selection procedure, provide a scientific explanation of the separation process, explore scaling processes in centrifugal pumps, develop salt-deposition prediction methods and bring us closer to a scientific basis for automation of the entire pump-operation process. Implementation in oil-recovery practice of the findings developed in this collection of articles will surely enhance the economic efficiency of the method under consideration and allow for the creation of an environmentally-friendly method of oil production. Obtained results are fundamental and form the basis of the centrifugal-pump control theory.
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Назаренко, Г. В. "ВПЛИВ ПЕРЕПУСКНИХ ОТВОРІВ У ПРОВІДНОМУ ДИСКУ ВІДЦЕНТРОВОГО КОЛЕСА ШНЕКОВІДЦЕНТРОВОГО НАСОСА РРД НА ЙОГО НАПІР, ККД І КАВІТАЦІЙНІ ХАРАКТЕРИСТИКИ". System design and analysis of aerospace technique characteristics 30, n.º 1 (7 de novembro de 2022): 65–73. http://dx.doi.org/10.15421/472207.
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In modern rocket technology, liquid rocket engines (LRE) with a pump fuel supply system have become widespread. The pump is the heart of the engine, because it supplies the engine with fuel. When designing some pumps, there is a need for bypass holes in the drive disk of the centrifugal wheel.
As part of the research, a comprehensive analysis of the pressure, efficiency and cavitation characteristics of the high-speed inducer-centrifugal pump of the upper stages of the TPA LREwas performed. The characteristics of the pumps were obtained experimentally. The oxidizer and fuel pumps of engines No. 1 and No. 2 were analyzed. According to the results of the study, it was established that the presence of bypass holes in the drive disk of the center wheel of the inducer-centrifugal pump TPA LRE increases its efficiency under certain conditions. The pressure of the fuel pump of TPA LRE No. 2 increases to 2.6%, which has no holes in the leading disk of the centrifugal wheel. The presence or absence of bypass holes in the leading disk of the centrifugal wheel does not affect its cavitation characteristics.
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Fu, Jiangfeng, Huacong Li, Ding Fan, Wenbo Shen e Xianwei Liu. "Modeling and Efficiency Prediction of Aeroengine Centrifugal Pump Integrated Loss Model Based on One-Dimensional Flow". Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 36, n.º 5 (outubro de 2018): 807–15. http://dx.doi.org/10.1051/jnwpu/20183650807.
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This paper was presented a method of integrated loss model by considering all kinds of loss type in centrifugal pumps. The geometric structure and loss mechanism of the flow parts in the centrifugal pump were analyzed, such as suction chamber, impeller, vaneless diffuser chamber, volute type water collecting chamber and outlet diffusion section. The hydraulic loss model, volume loss model, friction loss and mechanical loss model of centrifugal pump were established respectively by combining the flow theory. Finally, an integrated loss model of centrifugal pump was constructed, which can establish the relationship between the 12 main design parameters and pump efficiency of the centrifugal pump. Then the performance prediction of an aeroengine fuel centrifugal pump was carried out based on the loss model, and the loss model predictions were compared with the experimental data and CFD simulation performance prediction data. Simulation results show that:The efficiency predicted value relative error of centrifugal pump is less than 2.8% between the loss model and the experimental data. The computational efficiency of CFD is less than 4.4% compared with the experimental data in the design condition. The relative error is about 1.6% between the CFD method and the loss model which shows that the loss model predicts efficiency accuracy is better than the CFD method. It shows that this method can be used to predict the efficiency performance of centrifugal pump under design process.
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Chen, Lei, Lijun Wei, Yu Wang, Junshuo Wang e Wenlong Li. "Monitoring and Predictive Maintenance of Centrifugal Pumps Based on Smart Sensors". Sensors 22, n.º 6 (9 de março de 2022): 2106. http://dx.doi.org/10.3390/s22062106.
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Centrifugal pumps have a wide range of applications in industrial and municipal water affairs. During the use of centrifugal pumps, failures such as bearing wear, blade damage, impeller imbalance, shaft misalignment, cavitation, water hammer, etc., often occur. It is of great importance to use smart sensors and digital Internet of Things (IoT) systems to monitor the real-time operating status of pumps and predict potential failures for achieving predictive maintenance of pumps and improving the intelligence level of machine health management. Firstly, the common fault forms of centrifugal pumps and the characteristics of vibration signals when a fault occurs are introduced. Secondly, the centrifugal pump monitoring IoT system is designed. The system is mainly composed of wireless sensors, wired sensors, data collectors, and cloud servers. Then, the microelectromechanical system (MEMS) chip is used to design a wireless vibration temperature integrated sensor, a wired vibration temperature integrated sensor, and a data collector to monitor the running state of the pump. The designed wireless sensor communicates with the server through Narrow Band Internet of Things (NB-IoT). The output of the wired sensor is connected to the data collector, and the designed collector can communicate with the server through 4G communication. Through cloud-side collaboration, real-time monitoring of the running status of centrifugal pumps and intelligent diagnosis of centrifugal pump faults are realized. Finally, on-site testing and application verification of the system was conducted. The test results show that the designed sensors and sensor application system can make good use of the centrifugal pump failure mechanism to automatically diagnose equipment failures. Moreover, the diagnostic accuracy rate is above 85% by using the method of wired sensor and collector. As a low-cost and easy-to-implement solution, wireless sensors can also monitor gradual failures well. The research on the sensors and pump monitoring system provides feasible methods and an effective means for the application of centrifugal pump health management and predictive maintenance.
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Ntoko, N.-M. "Combined Characteristics of Dissimilar Centrifugal Pumps". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 210, n.º 3 (junho de 1996): 233–36. http://dx.doi.org/10.1243/pime_proc_1996_210_036_02.
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It is shown that the dissipation characteristic of a centrifugal pump can be obtained from the normal characteristic of the same pump. Using the dissipation characteristic of the weaker of two pumps coupled in parallel and the normal characteristic of the larger of the two pumps, an expression for the combined characteristics of the pumps is then obtained. Graphical results are presented for two sets of pumps.
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Wu, Xinhao, Peilan Su, Jianhua Wu, Yusheng Zhang e Baohe Wang. "Research on the Relationship between Sediment Concentration and Centrifugal Pump Performance Parameters Based on CFD Mixture Model". Energies 15, n.º 19 (1 de outubro de 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, Jianyi, Hao Yang, Haibing Liu, Liang Xu e Yuwei Lv. "Pressure Fluctuation Characteristics of High-Speed Centrifugal Pump with Enlarged Flow Design". Processes 9, n.º 12 (15 de dezembro de 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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Choi, Young-Do, Junichi Kurokawa e Jun Matsui. "Performance and Internal Flow Characteristics of a Very Low Specific Speed Centrifugal Pump". Journal of Fluids Engineering 128, n.º 2 (5 de setembro de 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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Zhu, Han, Ning Qiu, Chuan Wang, Qiaorui Si, Jie Wu, Fanjie Deng e Xiang Liu. "Prediction of Cavitation Evolution and Cavitation Erosion on Centrifugal Pump Blades by the DCM-RNG Method". Scanning 2021 (15 de novembro de 2021): 1–12. http://dx.doi.org/10.1155/2021/6498451.
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Cavitation can reduce the efficiency and service life of the centrifugal pumps, and a long-term operation under cavitation conditions will cause cavitation damage on the surface of material. The external characteristic test of the IS65-50-174 single-stage centrifugal pump was carried out. Moreover, the cavitation mechanism under specific conditions was analyzed by numerical simulation. Considering the macroscopic cavitation flow structure in the centrifugal pump, three different cavitation erosion prediction methods were used to predict the erodible areas. The results show that the calculation results obtained by the density correction method (DCM) can well match the flow characteristics of the centrifugal pump under the rated conditions. When the centrifugal pump head drops by 3%, cavitation mainly occurs on the suction surface, and the cavity on the pressure surface is mainly concentrated near the front cover. The cavitation prediction method based on the time derivation of pressure change is not suitable for centrifugal pumps, while the prediction result of the erosive power method is more reasonable than the others. At time 0.493114 s, the maximum erosive power appears on the blade near the volute tongue, and its value is 1.46 e − 04 W.
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Yuan, Jianping, Jiali Shi, Yanxia Fu, Huilong Chen, Rong Lu e Xueliang Hou. "Analysis of Fluid-Structure Coupling Dynamic Characteristics of Centrifugal Pump Rotor System". Energies 15, n.º 6 (15 de março de 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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Alcaraz, Andrea, Andres Pichon-Riviere, Carlos Rojas-Roque, Juan Martín González, Daniela Prina, Germán Solioz, Federico Augustovski e Alfredo Palacios. "Cost-effectiveness of a centrifugal-flow pump for patients with advanced heart failure in Argentina". PLOS ONE 17, n.º 8 (1 de agosto de 2022): e0271519. http://dx.doi.org/10.1371/journal.pone.0271519.
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Background Centrifugal-flow pumps are novel treatment options for patients with advanced heart failure (HF). This study estimated the incremental cost-effectiveness ratio (ICER) of centrifugal-flow pumps for patients with advanced HF in Argentina. Methods Two Markov models were developed to estimate the cost-effectiveness of a centrifugal-flow pump as destination therapy (DT) in patients with contraindication for heart transplantation, and as bridge-to-transplant (BTT), with a lifetime horizon using the third-party payer Social Security (SS) and Private Sector (PS) perspectives. Clinical, epidemiological, and quality-adjusted life years (QALY) parameters were retrieved from the literature. Direct medical costs were estimated through a micro-costing approach (exchange rate USD 1 = ARS 59.95). Results The centrifugal-flow pump as a DT increased the per patient QALYs by 3.5 and costs by ARS 8.1 million in both the SS and PS, with an ICER of ARS 2.3 million per QALY. Corresponding values for a centrifugal-flow pump as BTT were 0.74 QALYs and more than ARS 8 million, yielding ICERs of ARS 11 million per QALY (highly dependent on waiting times). For the 1, 3, and 5 GDP per QALY thresholds, the probability of a centrifugal-flow pump to be cost-effective for DT/BTT was around 2%/0%, 40%/0%, and 80%/1%, respectively. Conclusion The centrifugal-flow pump prolongs life and improves the quality of life at significantly higher costs. As in Argentina there is no current explicit cost-effectiveness threshold, the final decision on reimbursement will depend on the willingness to pay in each subsector. Nevertheless, the centrifugal-flow pump as a DT was more cost-effective than as a BTT.
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Shiels, Stan. "Centrifugal pump academy". World Pumps 1999, n.º 394 (julho de 1999): 29–31. http://dx.doi.org/10.1016/s0262-1762(00)87110-2.
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Shiels, Stan. "Centrifugal pump academy". World Pumps 1997, n.º 364 (janeiro de 1997): 34–37. http://dx.doi.org/10.1016/s0262-1762(97)86577-7.
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Shiels, Stan. "Centrifugal Pump Academy". World Pumps 1998, n.º 380 (maio de 1998): 57–60. http://dx.doi.org/10.1016/s0262-1762(99)80361-7.
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Shiels, Stan. "Centrifugal Pump Academy". World Pumps 1998, n.º 384 (setembro de 1998): 56–59. http://dx.doi.org/10.1016/s0262-1762(99)80457-x.
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Shiels, Stan. "Centrifugal Pump Academy". World Pumps 1998, n.º 376 (janeiro de 1998): 40–45. http://dx.doi.org/10.1016/s0262-1762(99)80589-6.
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Dai, Cui, Chao Guo, Yiping Chen, Liang Dong e Houlin Liu. "Analysis of the Influence of Different Bionic Structures on the Noise Reduction Performance of the Centrifugal Pump". Sensors 21, n.º 3 (28 de janeiro de 2021): 886. http://dx.doi.org/10.3390/s21030886.
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The strong noise generated during the operation of the centrifugal pump harms the pump group and people. In order to decrease the noise of the centrifugal pump, a specific speed of 117.3 of the centrifugal pump is chosen as a research object. The bionic modification of centrifugal pump blades is carried out to explore the influence of different bionic structures on the noise reduction performance of centrifugal pumps. The internal flow field and internal sound field of bionic blades are studied by numerical calculation and test methods. The test is carried out on a closed pump test platform which includes external characteristics and a flow noise test system. The effects of two different bionic structures on the external characteristics, acoustic amplitude–frequency characteristics and flow field structure of a centrifugal pump, are analyzed. The results show that the pit structure has little influence on the external characteristic parameters, while the sawtooth structure has a relatively great influence. The noise reduction effect of the pit structure is aimed at the wide-band noise, while the sawtooth structure is aimed at the discrete noise of the blade-passing frequency (BPF) and its frequency doubling. The noise reduction ability of the sawtooth structure is not suitable for high-frequency bands.
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Kim, Hye In, Tae-Seong Roh, Hwanil Huh e Hyoung Jin Lee. "Development of Ultra-Low Specific Speed Centrifugal Pumps Design Method for Small Liquid Rocket Engines". Aerospace 9, n.º 9 (28 de agosto de 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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Ganushchak, Y., W. van Marken Lichtenbelt, T. van der Nagel e D. S. de Jong. "Hydrodynamic performance and heat generation by centrifugal pumps". Perfusion 21, n.º 6 (novembro de 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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Delaplain, Patrick T., Lishi Zhang, Danh V. Nguyen, Amir H. Ashrafi, Peter T. Yu, Matteo Di Nardo, Yanjun Chen, Joanne Starr, Henri R. Ford e Yigit S. Guner. "Effect of pump type on outcomes in neonates with congenital diaphragmatic hernia requiring ECMO". Perfusion 33, n.º 1_suppl (maio de 2018): 71–79. http://dx.doi.org/10.1177/0267659118766729.
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Purpose: With the exception of neonatal respiratory failure, most centers are now using centrifugal over roller-type pumps for the delivery of extracorporeal membrane oxygenation (ECMO). Evidence supporting the use of centrifugal pumps specifically in infants with congenital diaphragmatic hernia (CDH) remains lacking. We hypothesized that the use of centrifugal pumps in infants with CDH would not affect mortality or rates of severe neurologic injury (SNI). Methods: Infants with CDH were identified within the ELSO registry (2000-2016). Patients were then divided into those undergoing ECMO with rollertype pumps or centrifugal pumps. Patients were matched based on propensity score (PS) for the ECMO pump type based on pre-ECMO covariates. This was done for all infants and separately for each ECMO mode, venovenous (VV) and venoarterial (VA) ECMO. Results: We identified 4,367 infants who were treated with either roller or centrifugal pumps from 2000-2016. There was no difference in mortality or SNI between the two pump types in any of the groups (all infants, VA-ECMO infants, VV-ECMO infants). However, there was at least a six-fold increase in the odds of hemolysis for centrifugal pumps in all groups: all infants (odds ratio [OR] 6.99, p<0.001), VA-ECMO infants (OR 8.11, p<0.001 and VV-ECMO infants (OR 9.66, p<0.001). Conclusion: For neonates with CDH requiring ECMO, there is no survival advantage or difference in severe neurologic injury between those receiving roller or centrifugal pump ECMO. However, there is a significant increase in red blood cell hemolysis associated with centrifugal ECMO support.
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Ganushchak, Yuri M., Erik PJ Körver e Jos G. Maessen. "Is there a “safe” suction pressure in the venous line of extracorporeal circulation system?" Perfusion 35, n.º 6 (4 de julho de 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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Mikhaylova, S. V., e I. A. Pogrebnaya. "INCREASING CENTRIFUGAL PUMP PERFORMANCE". Herald of Dagestan State Technical University. Technical Sciences 46, n.º 2 (28 de agosto de 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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SCUPI, Andrei-Alexandru, Mariana PANAITESCU e Fanel-Viorel PANAITESCU. "NUMERICAL SIMULATION OF CENTRIFUGAL PUMP". Journal of Marine Technology and Environment, n.º 1 (1 de abril de 2023): 50–53. http://dx.doi.org/10.53464/jmte.01.2023.08.
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"Centrifugal pumps are most commonly used pumping devices in industry their being fit for pumping water. There are several types of centrifugal pumps, their differences in construction is due to their size and how cloggy the pumped water is. In the paper it was simulated a 2D centrifugal pump of small size used in daily activities. The simulation, performed with CFD (ANSYS-Fluent), was made for different inlet velocities of water. Different parameters, such as inlet pressure, outlet pressure, maximum velocity and flow rate, were calculated and graphically represented against inlet velocity. Also, graphical representation of pressure distribution ."
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Ma, Shi, e Yiou Liu. "CFD analysis and prediction of centrifugal pump cavitation performance based on three-dimensional two-phase flow between impeller and worm gear". Journal of Physics: Conference Series 2441, n.º 1 (1 de março de 2023): 012048. http://dx.doi.org/10.1088/1742-6596/2441/1/012048.
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Abstract Cavitation performance is an important performance indicator of centrifugal pumps. The occurrence of cavitation will trigger a complex gas-liquid two-phase flow, which will reduce the efficiency of a low ratio centrifugal pump and cause machine vibration, as well as damage to the impeller, seriously affecting the working performance and preventing its normal operation. In this paper, CFD numerical simulation is used to analyze the cavitation characteristics of a centrifugal pump, obtain its internal flow law, calculate the cavitation margin of the device and the head generated by the pump under each inlet condition, and thus predict the critical cavitation margin of the pump at this flow point.
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Al-Halhouli, Ala’aldeen, Baha El Far, Ahmed Albagdady e Wisam Al-Faqheri. "Development of Active Centrifugal Pump for Microfluidic CD Platforms". Micromachines 11, n.º 2 (27 de janeiro de 2020): 140. http://dx.doi.org/10.3390/mi11020140.
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The continuous emerging of microfluidic compact disc (CD) platforms for various real-life applications motivates researchers to explore new innovative ideas towards more integrated active functions. However, microfluidic CDs have some drawbacks, including the unidirectional flow that limits the usable space for multi-stepped biological and chemical assays. In this work, a novel active and bidirectional centrifugal pump is developed and integrated on microfluidic CDs. The design of the developed pump partially replicates the designs of the conventional centrifugal pumps with a modification in the connecting channels’ positions that allow the developed pump to be reversible. The main advantage of the proposed centrifugal pump is that the pumping speed can be accurately controlled during spinning or while the microfluidic CD is stationary. Performance tests show that the pumping speed can reach up to 164.93 mm3/s at a pump rotational speed (impellers speed) of 4288 rpm. At that speed, 1 mL of water could be pumped in 6.06 s. To present a few of the potential applications of the centrifugal pump, flow reciprocation, bidirectional pumping, and flow switching were performed and evaluated. Results show that the developed centrifugal pump can pump 1096 µL of liquid towards the CD center at 87% pumping efficiency while spinning the microfluidic CD at 250 rpm. This novel centrifugal pump can significantly widen the range of the applicability of microfluidic CDs in advanced chemical processes and biological assays.
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Ren, Nai Fei, Ming Min Chen, Jie Jiang e Li Cheng. "Flow Numerical Simulation of Centrifugal Pump with Splitting Blades Based on RE". Applied Mechanics and Materials 43 (dezembro de 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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Som, O. I. "Centrifugal plasma surfacing of drill pump bushings". Paton Welding Journal 2022, n.º 4 (28 de abril de 2022): 14–18. http://dx.doi.org/10.37434/tpwj2022.04.03.
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Liu, Mei Qing, Qiu Wei Li, Yao Hua Bai, Zhi Yong Liu e Pei Jie He. "Efficiency and Pressure Pulsation Analysis of a Double Suction Centrifugal Pump with Different Arrangement Impellers". Advanced Materials Research 433-440 (janeiro de 2012): 709–15. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.709.
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Double suction centrifugal pumps are widely employed in large water supply projects. In the present study, a double suction centrifugal pump with the staggered arrangement impeller in a domestic water supply project has been mapping and modeling, and then the symmetrical arrangement impeller of a double suction centrifugal pump has been designed for comparison. The commercial code was used to investigate the pump efficiency and the time variation of pressure at the zone of volute tongue. This unsteady flow feature was investigated by the large eddy simulation (LES) method with the sliding mesh technology. The analysis indicated that the pump efficiency of the double suction centrifugal pump with staggered arrangement impeller is lower than that with the symmetrical one. The frequency of pressure pulsation at the volute tongue is consistent with the blade passing frequency. The staggered arrangement impeller can reduce the levels of pressure pulsation significantly.
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Gavade, Ramesh S., e Suresh M. Sawant. "Study of Mechanical Performance Affecting Factors in Split Casing Pump". International Journal of Engineering and Advanced Technology 10, n.º 2 (30 de dezembro de 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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Wu, Chengshuo, Jun Yang, Shuai Yang, Peng Wu, Bin Huang e Dazhuan Wu. "A Review of Fluid-Induced Excitations in Centrifugal Pumps". Mathematics 11, n.º 4 (17 de fevereiro de 2023): 1026. http://dx.doi.org/10.3390/math11041026.
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This paper describes the related research work in the field of fluid-induced vibration of centrifugal pumps conducted by many researchers. In recent years, all walks of life have put forward higher demands for the vibration performance of pumps which drives the investigation on the root cause of pump vibration and the development of guidelines for the design of low-vibration pumps. Fluid-induced excitation is the most important and significant source of pump vibration. Understanding its generation mechanism and dominant characteristics is important for developing low-vibration pump design methodology. This paper starts with the analysis of unsteady flow in the centrifugal pump and summarizes unsteady flow characteristics such as jet–wake structure, secondary flow, and rotational stall in the operating pump. Based on the understanding of the unsteady flow structure in the pump, the fluid-induced excitation mechanism and its characteristics based on the investigation of unsteady pressure pulsation and excitation forces in the pump are summarized. For the pump operating at nominal flow rate, the excitation at blade passing frequency (BPF) dominates and related suppression methods are classified and summarized to provide reference for the design of a low-vibration pump.
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Jing, Teng, Yujiao Cheng, Fangqun Wang, Wei Bao e Ling Zhou. "Numerical Investigation of Centrifugal Blood Pump Cavitation Characteristics with Variable Speed". Processes 8, n.º 3 (4 de março de 2020): 293. http://dx.doi.org/10.3390/pr8030293.
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In this paper, the cavitation characteristics of centrifugal blood pumps under variable speeds were studied by using ANSYS-CFX and MATLAB software. The study proposed a multi-scale model of the “centrifugal blood pump—left heart blood circulation”, and analyzed the cavitation characteristics of the centrifugal blood pump. The results showed that the cavitation in the impeller first appeared near the hub at the inlet of the impeller. As the inlet pressure decreased, the cavitation gradually strengthened and the bubbles gradually developed in the outlet of the impeller. The cavitation intensity increased with the increase of impeller speed. The curve of the variable speeds of the centrifugal blood pump in the optimal auxiliary state was obtained, which could effectively improve the aortic pressure and flow. In variable speeds, due to the high aortic flow and pressure during the ejection period, the sharp increases in speeds led to cavitation. The results could provide a guidance for the optimal design of the centrifugal blood pump.
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NGUYEN, Van Thanh Tien, e Thi Minh Nhut VO. "Centrifugal Pump Design: An Optimization". Eurasia Proceedings of Science Technology Engineering and Mathematics 17 (16 de setembro de 2022): 136–51. http://dx.doi.org/10.55549/epstem.1176074.
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A centrifugal pump is an efficient piece of machinery that is often used in the activities of our everyday lives as well as the production of industrial goods. Due to the ever-increasing demands of our contemporary lifestyle, the process of designing a pump is becoming more authoritarian and demanding. In order to assist designers in overcoming these limits, an optimization algorithm would be suggested. This algorithm would help designers use optimum design methodologies and reduce risk throughout the manufacturing stage. ANSYS's Computational Fluid Dynamics (CFD) tool was used to develop numerical models for simulation. These models were created using ANSYS. For the purpose of the multi-objective optimization design, the simulation's best-chosen model was taken into consideration. This algorithm was used throughout the process of designing the ideal solution. Several design models were created by selecting characteristics such as the size of the pump volute casing section, the tongue's length, and the tongue's angle. The findings demonstrate that the provided strategy is viable for resolving the issue with the optimal design. These findings have the potential to serve as an encouraging reference for companies that manufacture centrifugal pumps, as well as researchers who are interested in applying their invention and development to the pump design sector in the future.
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Liu, Jian Hua, e Ming Yi Zhu. "Simulation Study on Attrition to Centrifugal Sewerage Pump". Key Engineering Materials 474-476 (abril de 2011): 1107–10. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1107.
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By Means of Fluent 6.3，the paper simulated the solid-liquid two-phase flow to a type of centrifugal sewerage pump under different sand size and contain arenaceous concentration conditions, using Eulerian Mixture Model, adopting SIMPLE algorithm, k-ε-Ap turbulence model and partitioning non-structure hex grid in the area of flow passage in the pump. The paper analyzed wear characteristics in different parts of centrifugal sewage pump impeller and put forward some means to decrease attrition for impeller. The results can be as theoretical reference for the optimization design of the centrifugal sewage pumps