Relevant bibliographies by topics / Centrifugal pumps – Performance

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  2. Dissertations / Theses
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  5. Conference papers

Academic literature on the topic 'Centrifugal pumps – Performance'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Centrifugal pumps – Performance"

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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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Dissertations / Theses on the topic "Centrifugal pumps – Performance"

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Grist, E. "The volumetric performance of cavitating centrifugal pumps." Thesis, Bucks New University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372318.

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Posner, Barry. "The long-term performance of large centrifugal sand slurry pumps." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/MQ34405.pdf.

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Weimer, Richard George Jr. "Centrifugal pump performance prediction using quasi-three-dimensional flow analysis." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/17693.

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Storteig, Eskild. "Dynamic characteristics and leakage performance of liquid annular seals in centrifugal pumps." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2000. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-453.

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In centrifugal pumps the leakage and dynamic characteristics of annular seals are important factors for pump performance. Both seal leakage and dynamics are greatly affected by the relationship between fluid flow and wall friction. In this thesis explicit friction factors were developed which relate the turbulent fluid flow in the seal to wall friction for seals with rectangular grooves. Computational Fluid Dynamics (CFD) was used to study a range of groove width to depth ratios between 1 and 16 and groove depth to clearance ratios between 0.2 and 25.8. In this range an optimal groove geometry for leakage reduction was found which may increase the volumetric effciency of pumps considerably. Based on a similarity assumption for grooves and hole patterns a friction factor was proposed for hole pattern seals.

Based on the developed friction factors extensions were made to a theory for predicting dynamic characteristics of plain seals to deal with grooved and hole-patterned seals or a combination of both. The method does not require calibration to experiments in order to give useful results. A parameter study indicated that for certain stator hole patterns the cross-coupled stiffness could be greatly reduced compared to that of a smooth seal. This means that self excited vibrations from the seal may be prevented and the range of stable operation of the pump may be increased. Another extension of the theory accounts for angular stiffness, damping, and added mass moment of inertia for tapered seals. A previously published isotropic friction factor based on pipe flow in the transition between laminar and fully turbulent flow was also invluded in the theory for predicting dynamic coefficients. Results compared well to previously published theoretical results, however, comparisons to experimental results indicate that this friction factor is of limited use for seals.

Inlet and exit conditions of seals affect both seal leakage and rotordynamic coefficients to some extent. An experimental study of inlet and exit losses for seals with sharp, chamfer, and protruding edge inlet and exit geometrics was carried out for a range of axial and tangential flow veloocities. The inlet loss was sensitive to geometry changes, while the exit loss was not. The commonly used assumptions of no rotational speed dependency for entrance and exit losses holds well when the average tangential flow is less than or equal to the axial flow. However, as the tangential flow became much alrger than the axial flow this assumption did not hold well. In the same study leakage for seals with shallow grooves was studied. Experimental leakage results for shallow grooves on the rotor corresponded well with theoretical predictions based on the friction factor developed in this thesis.

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Kabamba, Batthe Matanda. "Evaluation of centrifugal pump performance derating procedures for non-Newtonian slurries." Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/2170.

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Thesis (MTech(Civil Engineering))--Cape Peninsula University of Technology, 2006.
The performance of a centrifugal pump is altered for slurry or viscous materials (Stepanoff, 1969) and this needs to be accounted for. Usually, the suitable selection and evaluation of centrifugal pumps is based only on water pump performance curves supplied by the pump manufacturer (Wilson, Addie, Sellgren & Clift, 1997). In 1984 Walker and Goulas conducted a number of pump performance tests with kaolin clay slurries and coal slurries on a Warman 4/3 AH horizontal slurry pump and a Hazleton 3-inch B CTL horizontal pump (Walker and Goulas, 1984). Walker and Goulas have analysed the test data and correlated the performance derating both at the best efficiency flow rate (BEP) and at 10% of the best efficiency flow rate (0.1 BEP) to the modified pump Reynolds number (NRep). They have noticed that the head and the efficiency reduction ratio decreased for the pump Reynolds number less then 10⁶. Furthermore, Walker and Goulas obtained a reasonably good agreement (± 5%) between pump test data for non-Newtonian materials and pump performance prediction using the Hydraulics Institute chart. Sery and Slatter (2002) have investigated pump deration for non-Newtonian yield pseudoplastic materials. The NRep was calculated using the Bingham plastic viscosity (µp). Results have shown good agreement with regard to head and efficiency reduction ratios in comparison with previous work. However, Sery and Slatter's pump performance correlation using the HI chart did not reach the same conclusion. Error margin of ± 20% and ± 10% were found for head and efficiency respectively. This study is an attempt to reconcile the differences between Walker and Goulas (1984) and Sery and Slatter (2002) and extend the evaluation of these derating methods to pseudoplastic materials. The test work was conducted in the Flow Process Research Centre laboratory of the Cape Peninsula University of Technology using two centrifugal pumps; a Warman 6/4 and a GrW 4/3. The materials used were water, CMC solution bentonite and kaolin suspension at different concentrations (7% and 9% by weight for bentonite; 5%, 6% and 7% by weight for CMC; 17%, 19% and 21% by volume for kaolin).
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Sahin, Fatma Ceyhun. "An Experimental Study On Off Design Performance And Noise In Small Pumps." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608418/index.pdf.

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This thesis study is focused on experimentally investigating pump noise at design and off-design operations and its relations with pressure fluctuations. Small size pumps are placed in a semi-anechoic chamber and operated at various system conditions and various rotational pump speeds. Pump operational data, noise data and time dependent pressure data are recorded. Fast Fourier Transform spectra of noise and pressure data are compared. Coherence spectrum between sound pressure level and hydraulic pressures are obtained. Data processing, Fast Fourier Transform and cross correlation are conducted with specific software Soundbook SAMURAI. The experiments have indicated that system characteristics or pump size do not have any influence on the noise of pump. On the other hand, pump characteristics are found to be distinguishable by means of peak frequencies on the sound spectra which are proportional to blade passing frequency. Results of cross correlations also show that, pump outlet pressure is a more significant source of noise than pump inlet pressure.
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Sikorska, Joanna Zofia. "The application of acoustic emission monitoring to the detection of flow conditions in centrifugal pumps." University of Western Australia. School of Mechanical Engineering, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0098.

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[Truncated abstract] Centrifugal pumps are the most prevalent, electrically powered rotating machines used today. Each pump is designed to deliver fluid of a given flow rate at a certain pressure. The point at which electrical energy is converted most efficiently into increased pressure is known as the Best Efficiency Point. For a variety of reasons, pumps often operate away from this point (intentionally or otherwise), which not only reduces efficiency, but also increases the likelihood of premature component failure. Acoustic emissions (AE) are high frequency elastic waves, in the range of 20-2000kHz, released when a material undergoes localised plastic deformation. Acoustic emission testing is the process of measuring and analysing these stress waves in an attempt to diagnose the nature and severity of the underlying fault. AE sensors mounted on the surface of a machine or structure also detect any stress waves generated within the fluid being transmitted through to the structure. Unfortunately, attempts to detect incipient component faults in centrifugal pumps using acoustic emission analysis have been complicated by the sensitivity of AE to a pump?s operating state. Therefore, the aim of this thesis was to determine how acoustic emission monitoring could be used to identify the hydraulic conditions within a pump. Data was collected during performance tests from a variety of small end-suction pumps and from one much larger double-suction pump. A system was developed to collect, process and analyse any number of AE features (be they related to discrete AE events, or due to the continuous background AE level) from continuously operating equipment. ... Unfortunately, results from smaller pumps were less conclusive, particularly at low flows, probably due to the relatively small changes in hydraulic energy across the range of flows, and consequent sensitivity to the testing process. However, even in these pumps consistent patterns in hit energies were observed resulting in the conclusion that low to medium flows in centrifugal pumps are typified by a very large number of very low energy (VLE) events. These decrease in number and increase in energy as flow approaches BEP and/or is reduced to very low flows. High flows above BEP are marked by an absence of these VLE events, with bursts having significantly higher energies and spread over a much greater range. Unfortunately, these VLE events are too small to affect averaged trends, indicating that further work on a suitable filter is required. vi
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Engin, Ertan. "Design, Construction And Performance Evaluation Of A Submersible Pump With Numerical Experimentation." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/12606532/index.pdf.

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Due to the increasing demand, nonclog type sewage pumps are designed and manufactured in large amounts all over the world. However, a methodology on the design of these special duty pumps is not encountered in the literature. Therefore, the manufacturers tend to develop their own empirical methodologies. In this thesis, a nonclog pump is designed and constructed on the basis of suitable approaches of known centrifugal pump design methods. In this frame, a nonclog type submersible pump that is capable of handling solids, up to a diameter of 80 mm is aimed to be designed. The designed pump delivers 100 l/s flow rate against a head of 24 m. The rotational speed of the pump is 1000 rpm. Design procedure and the important points that differ nonclog pump design from standard centrifugal pump designs are given. In addition, hydraulic characteristics of two nonclog pumps, one of which is the pump designed in this study, are investigated by means of computational fluid dynamics (CFD) code. The designed pump is manufactured and tested in Layne Bowler Pump Company Inc. The test result indicates that design point is reached with a deviation in the limits of the related standard. Wire to water total best efficiency obtained by the test is 60%. Close agreement between results of actual test and numerical experimentation performed by CFD code shows that CFD analysis is a quite useful tool in predicting the hydraulic characteristics of nonclog pumps. Moreover, the pump is tested at 750 rpm and the test results are found to be in good agreement with the similitude anaysis results.
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Laseter, Joel Tyler III. "Holistic Performance Evaluation of the Built Environment: The Olin Building Past, Present & Future." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1544173911724874.

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Ofuchi, Edgar Minoru. "Desenvolvimento de um método para correção de curvas de desempenho em bombas centrífugas submersas operando com fluidos viscosos." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1803.

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CAPES
A bomba centrífuga submersa (BCS) é utilizada na indústria do petróleo como uma técnica de elevação artificial. Entretanto, o bombeamento de petróleo está associado a escoamentos de óleo de diferentes viscosidades. Esta condição leva a degradação do desempenho em relação à operação com água, na qual a bomba é originalmente projetada. Neste cenário no presente trabalho é desenvolvido um estudo numérico do escoamento em três estágios de duas BCSs semi-axiais. As equações transientes da conservação da massa e do balanço da quantidade de movimento, que modelam o escoamento nas BCSs, são resolvidas numericamente utilizando o programa computacional comercial Ansys-CFX. A turbulência do escoamento foi modelada utilizando o modelo SST. Os resultados numéricos obtidos foram comparados contra dados experimentais e de catálogo mostrando uma boa concordância, para uma grande faixa de viscosidades e rotações. Grupos adimensionais (n, n, n e Re) foram usados para avaliar a degradação do desempenho das BCSs. Além disso, os fenômenos envolvidos no escoamento no interior do rotor das bombas centrífugas foram analisados através dos campos de velocidade obtidos numericamente. A partir dos resultados numéricos foi verificado que a degradação do desempenho é diretamente relacionada com o número de Reynolds de rotação, Re. Também, observou-se que a degradação do desempenho ocorre para uma rotação específica normalizada constante n, no qual bombas de diferentes geometrias apresentaram degradação do desempenho similar. Além disso, dados experimentais e os resultados numéricos obtidos foram consistentes quando comparados com a relação entre os fatores de correção para a vazão e altura de elevação propostas por Stepanoff (1967). Uma definição de número de Reynolds modificado foi proposta e relaciona o fator de correção para altura de elevação com a viscosidade. Além disso, uma correlação entre o fator de correção para altura de elevação e o número de Reynolds modificado foi proposta, apresentando boa concordância. A partir das correlações obtidas, foi proposto um método para prever o desempenho de bombas centrífugas operando com fluidos de alta viscosidade, sendo comparado com outras metodologias encontradas na literatura. Certamente, as informações extraídas são relevantes para o entendimento do escoamento de fluidos de alta viscosidade em bombas, especialmente em BCSs semi-axiais de múltiplos estágios.
Electrical Submersible Pump (ESP) is used as an artificial lift technique. However, pumping viscous oil is generally associated with low Reynolds number flows. This condition leads to a performance degradation respect to the performance expected from the regular operation with water that most of the centrifugal pumps are originally designed for. These issues are considered in this investigation through a numerical study of the flow in two different multistage, semi-axial type ESPs. This investigation is carried out numerically using a Computational Fluid Dynamics (CFD) package, where the transient RANS equations are solved numerically. The turbulence is modeled using the SST model. Head curves for several operating conditions are compared with manufacturer’s curves and experimental data for a three-stage ESP, showing good agreement for a wide range of fluid viscosities and rotational speeds. Dimensionless numbers (n, n, n e Re) are used to investigate performance degradation of the ESPs. In addition, flow phenomena through the impellers of the ESPs are investigated using flow field from numerical results. Results show that performance degradation is directly related to rotational Reynolds number, Re. In addition, it was verified that performance degradation occurs for constant normalized specific speedn, which shows that performance degradation occurs similarly for different centrifugal pumps. Moreover, experimental data and numerical results agreed with a correlation from literature between head and flow correction factors proposed by Stepanoff (1967). A definition of modified Reynolds number was proposed and relates the head correction factor to viscosity. A correlation between head correction factor and the modified Reynolds number was proposed, which agreed well with numerical and experimental data. Then, a method to predict performance degradation based on the previous correlations was proposed. This method was compared with others from literature. In general, results and conclusions from this work can also be useful to bring more information about the flow of highly viscous fluids in pumps, especially in semi-axial, multistage ESPs.
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Books on the topic "Centrifugal pumps – Performance"

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Grabow, Gerd. Ein Beitrag zur Regelung und Schaltung von Kreiselpumpen. Leipzig: Deutscher Verlag für Grundstoffindustrie, 1989.

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Japikse, David. Centrifugal pump design and performance. Wilder, VT: Concepts ETI, 1997.

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American Institute of Chemical Engineers. Equipment Testing Procedures Committee., ed. Centrifugal pumps (Newtonian liquids): A guide to performance evaluation. 3rd ed. New York, NY: American Institute of Chemical Engineers, 2002.

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Neumann, B. The interaction between geometry and performance of a centrifugal pump. London: Mechanical Engineering Publications, 1991.

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International Conference on Part-Load Pumping Operation, Control and Behaviour (1988 Edinburgh, Scotland). Part-load pumping operation, control and behaviour: 1-2 September 1988, Heriot-Watt University, Edinburgh. Bury St. Edmunds, Suffolk [England]: Published for the Institution of Mechanical Engineers by Mechanical Engineering Publications Limited, 1988.

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Commission, European. Study on improving the energy efficiency of pumps. Brussels, Belgium: European Commission, 2003.

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Foley, W. J. Closeout of IE bulletin 80-18: Maintenance of adequate minimum flow thru centrifugal charging pumps following secondary side high energy line rupture. Washington, DC: Division of Operational Events Assessment, Office of Nuclear Reactor Regulation, U.S. Nuclear Regulatory Commission, 1988.

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Noghrehkar, Gholamreza. Investigation of centrifugal pump performance under two-phase flow conditions. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1993.

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Vaughn, Ward, and Jonathan Hector. Centrifugal Pumps: Characteristics, Uses and Performance. Nova Science Publishers, Incorporated, 2017.

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EUROPUMP. Operating Rotodynamic Pumps Away from Design Conditions (The Europump Guides to Advanced Pumping Technology, No. 3). Elsevier Science, 2000.

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Book chapters on the topic "Centrifugal pumps – Performance"

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Gülich, Johann Friedrich. "Performance Characteristics." In Centrifugal Pumps, 159–203. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40114-5_4.

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Gülich, Johann Friedrich. "Performance Characteristics." In Centrifugal Pumps, 169–217. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14788-4_4.

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Gülich, Johann Friedrich. "Performance characteristics." In Centrifugal Pumps, 145–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12824-0_4.

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Karassik, Igor J., and Terry McGuire. "Monitoring and Performance Testing." In Centrifugal Pumps, 893–915. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-6604-5_30.

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Gülich, Johann Friedrich. "Pump Types and Performance Data." In Centrifugal Pumps, 43–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40114-5_2.

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Gülich, Johann Friedrich. "Pump Types and Performance Data." In Centrifugal Pumps, 45–80. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14788-4_2.

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Gülich, Johann Friedrich. "Pump types and performance data." In Centrifugal Pumps, 39–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12824-0_2.

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Gülich, Johann Friedrich. "Influence of the Medium on Performance." In Centrifugal Pumps, 869–942. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40114-5_13.

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Gülich, Johann Friedrich. "Influence of the Medium on Performance." In Centrifugal Pumps, 1001–79. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14788-4_13.

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Gülich, Johann Friedrich. "Influence of the medium on performance." In Centrifugal Pumps, 741–808. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12824-0_13.

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Conference papers on the topic "Centrifugal pumps – Performance"

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Aly, S., and Sarim Al-Zubaidy. "Performance Prediction Method for Centrifugal Pumps." In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/921731.

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Eaton, A., F. D’Alessandro, W. Ahmed, and H. Hassan. "On the Performance Degradation of Centrifugal Pumps." In International Conference of Fluid Flow, Heat and Mass Transfer. Avestia Publishing, 2018. http://dx.doi.org/10.11159/ffhmt18.158.

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Wang Yong, Liu Hou Lin, Yuan Shou Qi, Tan Ming Gao, and Wang Kai. "Prediction research on cavitation performance for centrifugal pumps." In 2009 IEEE International Conference on Intelligent Computing and Intelligent Systems (ICIS 2009). IEEE, 2009. http://dx.doi.org/10.1109/icicisys.2009.5357921.

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Xue, Dun-Song, Guang-Jun Cao, and Xiao-Ling Chen. "Investigation on Performance Conversion of Centrifugal Oil Pumps Used in China." In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77044.

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A series of performance tests with different specific speeds (40, 50, 80, 90 and 130) were carried out on centrifugal oil pumps used in China’s oil industry under different conditions of liquid viscosities (1–300mm2/s) and pump rotating speeds (1000–3000rpm). The effect of viscosity on centrifugal oil pump performance and cavitations characteristic has been investigated. By considering the effects of flow rate viscosity and pump design parametric such as impeller outlet diameter and outlet width on the pump cavitations characteristics, a new performance and cavitations conversion correction factor diagram was plotted.
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Ofuchi, Edgar, Ana Leticia Lima Santos, Thiago Sirino, Henrique Stel, and Rigoberto Morales. "General model to predict performance degradation in centrifugal pumps." In 16th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2016. http://dx.doi.org/10.26678/abcm.encit2016.cit2016-0561.

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Bohn, Bryan, James Olson, Bhushan Gopaluni, and Boris Stoeber. "Sensing Concept for Practical Performance-Monitoring of Centrifugal Pumps." In 2019 IEEE SENSORS. IEEE, 2019. http://dx.doi.org/10.1109/sensors43011.2019.8956559.

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Moreno, Carlos Luis, Alejandro Fuenmayor, Gilberto Núñez, Jesús De Andrade, Ricardo Noguera, and Miguel Asuaje. "Numerical Investigation of Viscous Flow in Three Centrifugal Pumps." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72150.

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Centrifugal pump performance is affected when pumping viscous liquids, requiring a larger power input than the same pump handling water. In applications of chemical, civil, environmental, and mechanical engineering that involve centrifugal pumps, it is a challenge to accurately estimate and even more of a challenge to improve their performance when handling viscous liquids. When accurate performance data is needed, difficult experiments must be conducted with the operating viscous flow. The extension of the applicability of numerical techniques for solving fluid dynamics (CFD) permits the consideration of these tools as a definite possibility for predicting the performance of centrifugal pumps with viscous flows. The purpose of this study is to perform a 3D-CFD steady-state simulation of three different configurations of centrifugal pumps. The first is an impeller-diffuser pump (ns = 19) taken from an ESP model. The second is a Francis Pump-Turbine (ns = 28). Finally, the third configuration possesses an impeller and volute (ns = 32). The objective is to characterize and evaluate their performances with four different fluids from 1 to 420 cSt. These are: water at 25°C, SAE10 and SAE30 oils, and Fuel Oil Medium (FOM). For water flow conditions, the numerical results were compared with experimental data, and found to be consistent with global performance parameters. With regard to the higher viscosity fluids, the CFD calculation was compared with those obtained through the standard empirical method (ANSI/HI9.6.7). This resulted in good agreement between the performance results. The commercial software ANSYS-CFX was used for the CFD calculations. The resulting pump performance curve (head, hydraulic efficiency and power output) is consistent with that expected by theory. In general, as the viscosity of fluids increases, the hydraulic energy losses increase. Of the three pumps, slip factor for SAE30 oil was larger for all volumetric flows since it features the best guidance of the flow in the impeller blade passage. For the ns32 pump and the pump-turbine ns28, the volute losses rose from water to FOM, just like the impeller hydraulic losses. For these two turbo machines, the impeller losses were larger than volute losses. For the pumps with volute, the effects of fluid viscosity on the radial forces were evaluated. It was found that the radial forces decrease when the viscosity increases. This paper attempts to contribute to a better understanding of fluid dynamics within centrifugal pump impellers handling viscous fluids, and intends to shed more light on the approaches that performance prediction models should follow in the future.
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Das, Susanta K. "Experimental Performance Evaluation of a Centrifugal Pump With Different Impeller Vane Geometries." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38985.

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Centrifugal pumps vane geometry plays an important role in pump’s overall performance. Thus, to know the impeller vane geometry effects on the performance of a centrifugal pump are essential from pump’s design point of view. In this study, an experimental investigation is carried out to judge the impeller vane geometry effects on the performance of a centrifugal pump. The performance of three different impeller vane geometries is evaluated in this investigation. To acquire pump performance and characteristics curves, inlet and outlet valves were manually adjusted and the pump’s rpm were varied remotely through computer control. The pressure data were obtained via installed flow rotameter for different flow rates with constant pump speed – 1800 rpm. Experimental data were used to calculate different physical parameters, such as the pump head, water horsepower — the power added to the fluid, power input to the pump–brake horse power, and pump efficiency for each of impeller vane geometries. The pump’s performance curves and the system curves were then plotted for each of the vane geometries. The results show that the pump performance as well as efficiency varies significantly for each of the impeller vane geometries. The results help to understand how to determine appropriate operating conditions and design parameters for different impeller vane geometries for obtaining optimized pump performance.
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Hu, Bo, Shouqi Yuan, Weigang Lu, Tong Li, and Chenxu Guo. "Numerical Optimal Design of a Non-Overload Centrifugal Pump." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72152.

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Shaft power characteristics of centrifugal pumps attract extensive attentions in order to improve the operating reliability of pumps. TS-50-32-250 type low specific speed centrifugal pumps are selected as the research subjects. Three parameters of impeller including blade outlet angle β2, outlet width b2 and wrapping angle of blade θ are selected for the impeller shape optimization. Maximum flow design method and non-overload design method are adopted to design 7 impellers. Numerical simulation with CFX 12.1 is used 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 CFX 12.1 based on the standard k-ε turbulence model together with standard wall function. The structured grids of different qualities are used in unmodified impeller for comparison to confirm that the results are not influenced by the quality of mesh. The optimal impeller is obtained when β2, b2, θ are 18°, 7mm, 175°, respectively. The performances of NCPs at other working conditions satisfy the requirements of heads and efficiencies obtained from China National Standard. The shaft power reaches to 15 kW which is the power rating of the matched motor, at 1.45QR (35m3/h), showing that the non-overload performance of the pump is also significantly improved after modifying impeller geometries. Impeller 6 is considered as the optimal one and produced for experiments. Experiment results 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 heads of non-overload pumps at multiple operating conditions.
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Shigemitsu, Toru, Junichiro Fukutomi, and Kensuke Kaji. "Influence of Blade Outlet Angle and Blade Thickness on Performance and Internal Flow of Mini Centrifugal Pump." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-06035.

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Mini centrifugal pumps having a diameter smaller than 100mm are employed in many fields; automobile radiator pump, ventricular assist pump, cooling pump for electric devices and so on. Further, the needs for mini centrifugal pumps would become larger with the increase of the application of it for electrical machines. It is desirable that the mini centrifugal pump design be as simple as possible as precise manufacturing is required. But the design method for the mini centrifugal pump is not established because the internal flow condition for these small-sized fluid machines is not clarified and conventional theory is not suitable for small-sized pumps. Therefore, we started research on the mini centrifugal pump for the purpose of development of high performance mini centrifugal pumps with simple structure. Three types of rotors with different outlet angles are prepared for an experiment The performance tests are conducted with these rotors in order to investigate the effect of the outlet angle on performance and internal flow condition of mini centrifugal pumps. In addition to that, the blade thickness is changed because blockage effect in the mini centrifugal pump becomes relatively larger than that of conventional pumps. On the other hand, a three dimensional steady numerical flow analysis is conducted with the commercial code (ANSYS-Fluent) to investigate the internal flow condition. It is clarified from the experimental results that head of the mini centrifugal pump increases according to the increase of the blade outlet angle and the decrease of the blade thickness. In the present paper, the performance of the mini centrifugal pump is shown and the internal flow condition is clarified with the results of the experiment and the numerical flow analysis. Furthermore, the effects of the blade outlet angle and the blade thickness on the performance are investigated and the internal flow of each type of rotor is clarified by the numerical analysis results.
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