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Journal articles on the topic 'Low specific speed pump'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

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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2

Klas, R., F. Pochylý, and P. Rudolf. "Analysis of novel low specific speed pump designs." IOP Conference Series: Earth and Environmental Science 22, no. 1 (March 1, 2014): 012010. http://dx.doi.org/10.1088/1755-1315/22/1/012010.

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3

Chabannes, Lilian, David Štefan, and Pavel Rudolf. "Effect of Splitter Blades on Performances of a Very Low Specific Speed Pump." Energies 14, no. 13 (June 24, 2021): 3785. http://dx.doi.org/10.3390/en14133785.

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The usage of splitter blades to enhance the performances of low specific speed pumps is common practice. Based on experimental and numerical studies, the influence of the addition of one and two splitter blades is investigated on a very low specific speed pump to assess their impact not only on the performance characteristics but also on the losses in all pump domains. First, the main characteristic curves are discussed and it is shown that the usage of splitter blades enhances the head of the pump while not impairing its efficiency. Secondly, a detailed analysis of the losses in the pump reveals that splitter blades improve the flow in all parts of the pumps, but the volute. The flow at the impeller outlet shows that splitter blades largely benefit the slip factor and discharges a more blade-congruent flow in the volute. However, higher absolute velocity at the outlet of the impeller with splitter blades increases friction at the volute wall, as confirmed by the average wall shear stress in the different tested cases.

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4

Torabi, Rouhollah, and Seyyed Ahmad Nourbakhsh. "The Effect of Viscosity on Performance of a Low Specific Speed Centrifugal Pump." International Journal of Rotating Machinery 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/3878357.

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Centrifugal pump delivery head and flow rate drop effectively during the pumping of viscous fluids. Several methods and correlations have been developed to predict reduction rate in centrifugal pump performance when handling viscous fluids, but their results are not in very good agreement with each other. In this study, a common industrial low specific speed pump, which is extensively used in different applications, is studied. The entire pump, including impeller, volute, pipes, front and rear sidewall gaps, and balance holes, is simulated in Computational Fluid Dynamics and 3D full Navier Stokes equations are solved. CFD results are compared with experimental data such as pump performance curves, static pressure in casing, and disk friction loss. Dimensionless angular velocity and leakage rate are investigated in sidewall gap and efficiency variation due to viscosity is studied. The results demonstrate that the behavior of the fluid in sidewall gap is strictly sensitive to viscosity. Increasing viscosity improves the volumetric efficiency by reducing internal leakage through wear rings and balance holes, causing, however, a significant fall in the disk and overall efficiency. Results lead to some recommendations for designing centrifugal pumps which may be used in transferring viscous fluids.

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5

Fu, Qiang, Shou Qi Yuan, and Rong Sheng Zhu. "Pressure Fluctuation of the Low Specific Speed Centrifugal Pump." Applied Mechanics and Materials 152-154 (January 2012): 935–39. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.935.

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In order to study the rules of pressure fluctuation and the radial force under different positions in a centrifugal pump with low specific speed, and to find the relationship between each other, the three-dimensional ,unsteady Reynolds-averaged Navier-stokes equations with shear stress transport turbulent models were solved. The pressure fluctuation was obtained. The results showed that the pressure fluctuations were visible. The pressure fluctuations in the volute were relatively low at the design flow rate condition. The blade passing frequency dominates the pressure fluctuations, high frequency contents were found on the outlet of impeller but no high frequency information occured in casing. The radial force on the impeller was unsteady especially at the small flow rate.

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6

MATSUI, Jun, Junichi KUROKAWA, Manabu HARA, Koji NAKAMURA, and Hiroshi IMAMURA. "PTV on Volute Pump of Very Low Specific-Speed." Proceedings of the JSME annual meeting 2000.4 (2000): 37–38. http://dx.doi.org/10.1299/jsmemecjo.2000.4.0_37.

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7

Zhao, A., P. Wu, D. Z. Wu, and L. Q. Wang. "The optimization of a low specific speed pipeline pump." IOP Conference Series: Materials Science and Engineering 52, no. 3 (December 20, 2013): 032002. http://dx.doi.org/10.1088/1757-899x/52/3/032002.

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8

KAGAWA, Shusaku, Jun MATSUI, Junichi KUROKAWA, and Young-Do CHOI. "Loss Analysis of Very Low Specific Speed Centrifugal Pump." Transactions of the Japan Society of Mechanical Engineers Series B 73, no. 725 (2007): 219–24. http://dx.doi.org/10.1299/kikaib.73.219.

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9

Jafarzadeh, B., A. Hajari, M. M. Alishahi, and M. H. Akbari. "The flow simulation of a low-specific-speed high-speed centrifugal pump." Applied Mathematical Modelling 35, no. 1 (January 2011): 242–49. http://dx.doi.org/10.1016/j.apm.2010.05.021.

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10

Wang, Chun Lin, Chang Jun Li, Jian Ding, and Dong Liu. "Circulation Distribution of High Specific Speed Mixed-Flow Pump." Applied Mechanics and Materials 130-134 (October 2011): 1982–85. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1982.

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The load distribution of the impeller and the shape of blade bone surface as well as the pump performance are determined by the circulation distribution from the impeller inlet to the outlet. However, perfect conclusions about optimal forms of the circulation distribution have not been seen yet. In this paper, three kinds of circulation distributions were studied. Three mixed flow pump impellers with high specific speed were designed according to the circulation distributions, and the models of the three pumps were built and modeled in the commercial CFD code ANSYS-CFX 11.0. The flow field in the pumps has been investigated using large eddy simulation (LES). Experiment was carried out on one model. And the performance curves predicted by LES were compared with the experimental data, and good agreements were achieved. The results show that: there is a low pressure area at impeller outlet. The pressure distribution along the circumferential direction was asymmetry at the front-end area of guide vanes, but it becomes uniform at the end of guide vane. The bearing pressure on the pressure side of the model 2 is lower, and the pressure distribution of model 1 is more asymmetry and there is a clear low pressure area at outlet of blade; Cavitation performance of model 2 is better, and the maximum efficiency is also the highest, but the hump is more serious; Model 1 has a widest area of high effective area.

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11

Yang, Yang, Ling Zhou, Hongtao Zhou, Wanning Lv, Jian Wang, Weidong Shi, and Zhaoming He. "Optimal Design of Slit Impeller for Low Specific Speed Centrifugal Pump Based on Orthogonal Test." Journal of Marine Science and Engineering 9, no. 2 (January 26, 2021): 121. http://dx.doi.org/10.3390/jmse9020121.

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Marine centrifugal pumps are mostly used on board ship, for transferring liquid from one point to another. Based on the combination of orthogonal testing and numerical simulation, this paper optimizes the structure of a drainage trough for a typical low-specific speed centrifugal pump, determines the priority of the various geometric factors of the drainage trough on the pump performance, and obtains the optimal impeller drainage trough scheme. The influence of drainage tank structure on the internal flow of a low-specific speed centrifugal pump is also analyzed. First, based on the experimental validation of the initial model, it is determined that the numerical simulation method used in this paper is highly accurate in predicting the performance of low-specific speed centrifugal pumps. Secondly, based on the three factors and four levels of the impeller drainage trough in the orthogonal test, the orthogonal test plan is determined and the orthogonal test results are analyzed. This work found that slit diameter and slit width have a large impact on the performance of low-specific speed centrifugal pumps, while long and short vane lap lengths have less impact. Finally, we compared the internal flow distribution between the initial model and the optimized model, and found that the slit structure could effectively reduce the pressure difference between the suction side and the pressure side of the blade. By weakening the large-scale vortex in the flow path and reducing the hydraulic losses, the drainage trough impellers obtained based on orthogonal tests can significantly improve the hydraulic efficiency of low-specific speed centrifugal pumps.

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12

Li, Deng Song, Wen Wu Song, Fu Jie, and Tian Long Wu. "Applied Micro Genetic Algorithm to Optimize Design Low Specific Speed Pump Impeller." Advanced Materials Research 816-817 (September 2013): 1010–14. http://dx.doi.org/10.4028/www.scientific.net/amr.816-817.1010.

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The combination of enlarged flow design and micro-genetic algorithm constitute a new optimization design method, which be applied to optimization design of low specific speed pump impeller. It improves enlarged flow design deficiencies, and making overall performance of the pump better. The experimental results of a low specific speed centrifugal pump impeller designed by proposed method show that pump high efficiency range is extended, the hump phenomenon is eliminated, and shaft power overload phenomenon has been resolved.

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13

Shi, Baocheng, and Jinjia Wei. "Numerical Simulation of 3D Solid-Liquid Turbulent Flow in a Low Specific Speed Centrifugal Pump: Performance Comparison of Four Geometric Models." Advances in Mechanical Engineering 6 (January 1, 2014): 678271. http://dx.doi.org/10.1155/2014/678271.

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For numerically simulating 3D solid-liquid turbulent flow in low specific speed centrifugal pumps, there exist several problems including how to design geometrical shape of the calculation model to represent the real pump and how to predict pump performance accurately to guide the design of pump. To solve these problems, four kinds of geometric models were designed. The performance of a low specific speed solid-liquid centrifugal pump was predicted, and the results showed that the improved prediction methods are more accurate than the traditional method. Moreover, the simulation results of the entire flow field of the geometric model including balance holes and the lateral clearances of impeller in which liquid rotates with half speed of impeller are closer to the real situation.

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14

Sato, Ken, and Toru SHIGEMITSU. "Research on Performance Improvement of Low Specific Speed Centrifugal Pump." Proceedings of Mechanical Engineering Congress, Japan 2017 (2017): J0550101. http://dx.doi.org/10.1299/jsmemecj.2017.j0550101.

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15

Dai, Cui, and Liang Dong. "Flow in a Low Specific Speed Centrifugal Pump Using PIV." Advances in Mechanical Engineering 5 (January 2013): 178214. http://dx.doi.org/10.1155/2013/178214.

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16

Si, Qiaorui, Shouqi Yuan, Jianping Yuan, Chuan Wang, and Weigang Lu. "Multiobjective Optimization of Low-Specific-Speed Multistage Pumps by Using Matrix Analysis and CFD Method." Journal of Applied Mathematics 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/136195.

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The implementation of energy-saving and emission-reduction techniques has become a worldwide consensus. Thus, special attention should be provided to the field of pump optimization. With the objective of focusing on multiobjective optimization problems in low-specific-speed pumps, 10 parameters were carefully selected in this study for anL27(310) orthogonal experiment. The parameters include the outlet width of the impeller blade, blade number, and inlet setting angle of the guide vane. The numerical calculation appropriate for forecasting the performance of multistage pumps, such as the head, efficiency, and shaft power, was analyzed. Results were obtained after calculating the two-stage flow field of the pump through computational fluid dynamics (CFD) methods. A matrix method was proposed to optimize the results of the orthographic experiment. The optimal plan was selected according to the weight of each factor. Calculated results indicate that the inlet setting angle of the guide vane influences efficiency significantly and that the outlet angle of blades has an effect on the head and shaft power. A prototype was produced with the optimal plan for testing. The efficiency rating of the prototype reached 58.61%; maximum shaft power was within the design requirements, which verifies that the proposed method is feasible for pump optimization.

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17

Wei, Yangyang, Yang Yang, Ling Zhou, Lei Jiang, Weidong Shi, and Gaoyang Huang. "Influence of Impeller Gap Drainage Width on the Performance of Low Specific Speed Centrifugal Pump." Journal of Marine Science and Engineering 9, no. 2 (January 20, 2021): 106. http://dx.doi.org/10.3390/jmse9020106.

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The centrifugal pump is one of the most important pieces of energy-consuming equipment in various hydraulic engineering applications. This paper takes a low specific speed centrifugal pump as the research object. Based on the research method combining numerical calculation and experimental verification, the influence of the gap drainage structure on the performance of the low specific speed centrifugal pump and its internal flow field distribution were investigated. The flow field inside the low specific speed centrifugal pump impeller under different gap widths was studied. The comparison between the numerical calculation results and the experimental results confirms that the numerical calculations in this paper have high accuracy. It was found that the gap drainage will reduce the head of the low specific speed centrifugal pump, but increase its hydraulic efficiency. Using a smaller gap width could greatly improve the performance of the low specific speed centrifugal pump on the basis of a slight reduction in the head. The high-pressure leakage flow at the gap flows from the blade pressure surface to the suction surface can effectively suppress the low-pressure area at the impeller inlet. The flow rate of the high-pressure leakage flow increases with the gap width. Excessive gap width may cause a low-pressure zone at the inlet of the previous flow passage. These results could serve as a reference for the subsequent gap design to further improve the operating stability of the low specific speed centrifugal pump.

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18

Shi, Baocheng, and Jinjia Wei. "Numerical Simulation of 3D Solid-Liquid Turbulent Flow in a Low Specific Speed Centrifugal Pump: Flow Field Analysis." Advances in Mechanical Engineering 6 (January 1, 2014): 814108. http://dx.doi.org/10.1155/2014/814108.

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For numerically simulating 3D solid-liquid turbulent flow in low specific speed centrifugal pumps, the iteration convergence problem caused by complex internal structure and high rotational speed of pump is always a problem for numeral simulation researchers. To solve this problem, the combination of three measures of dynamic underrelaxation factor adjustment, step method, and rotational velocity control means according to residual curves trends of operating parameters was used to improve the numerical convergence. Numeral simulation of 3D turbulent flow in a low specific speed solid-liquid centrifugal pump was performed, and the results showed that the improved solution strategy is greatly helpful to the numerical convergence. Moreover, the 3D turbulent flow fields in pumps have been simulated for the bottom ash-particles with the volume fraction of 10%, 20%, and 30% at the same particle diameter of 0.1 mm. The two-phase calculation results are compared with those of single-phase clean water flow. The calculated results gave the main region of the abrasion of the impeller and volute casing and improve the hydraulic design of the impeller in order to decrease the abrasion and increase the service life of the pump.

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19

Zhang, Li, Hui Li, Hong Xu, Weidong Shi, Yang Yang, Wanhong Wang, and Ling Zhou. "Experimental and Numerical Investigation of Pressure Fluctuation in a Low-Specific-Speed Centrifugal Pump with a Gap Drainage Impeller." Shock and Vibration 2021 (June 30, 2021): 1–14. http://dx.doi.org/10.1155/2021/5571178.

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In order to analyze the effect of impeller with different slot widths on the performance of the low-specific-speed centrifugal pumps, based on the impeller of a single-stage pump with the specific speed of 21, two gap drainage schemes with slot widths of 1.5 mm and 6.0 mm, slot diameter of 180 mm, and lap length of 5 mm were designed. Both experimental and numerical simulation methods were applied to compare the steady performance, which includes the head, efficiency, and the internal flow field distribution, and the unsteady pressure pulsation performance between new designed pumps and the original pump. The results show that gap drainage would cause a certain degree of head reduction, but a smaller slot width could achieve higher efficiency. Meanwhile, a reasonable open seam scheme can reduce the development of pressure pulsation, which provides experience and reference for the stable operation of low-specific-speed centrifugal pumps.

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20

Yang, Chin Ting. "Hydrodynamic Efficiency Improvement of High-Specific-Speed Centrifugal Pump Impeller." Applied Mechanics and Materials 467 (December 2013): 461–65. http://dx.doi.org/10.4028/www.scientific.net/amm.467.461.

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The high-specific-speed centrifugal pumps are very common in industrial factory for transporting fluids all day long. However, oversized pumps with low performance still could meet the purpose of fluid transporting. The aim of this study was to reduce the existed commercial impeller energy consumption by optimizing the performance of impeller through CAE processes. The impeller model was first generated by BladeGen software and analyzed by CFX in Turbo-mode. The optimized model then exported to machine center to cut the precise aluminum mold. A regular sand die casting processes were used to manufacture the impeller. The original pump which only impeller was replaced with the new one was tested with performance measurement system again. The results show that when the mass flow rate between 40-90kg/s the CFD software predicted very well pump heads and efficiencies with experimental data, which was called optimized impeller. But around the minimum and maximum flow rate region, the recirculation flow between blades and frictional loss model used still need further investigation to shrink the difference. Compare to the original impeller, the optimized one had increased efficiency 6% at the mass flow rate of 80kg/s. Also the high efficiency region (nearby of BEP) of the new impeller had broadened 50%. And the maximum mass flow rate increased 13% than the original one.

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21

Choi, Young-Do, Shusaku Kagawa, and Junichi Kurokawa. "Influence of Large Change of Specific Speed on the Performance of Very Low Specific Speed Centrifugal Pump." Journal of Fluid Machinery 9, no. 1 (February 1, 2006): 40–46. http://dx.doi.org/10.5293/kfma.2006.9.1.040.

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22

Li, Xiaoyu, Yunguang Ji, Hongbin Cui, and Shuqi Xue. "Comparative Study on Turbulence Models of High-Speed Centrifugal Pump with Low Specific Speed." IOP Conference Series: Materials Science and Engineering 740 (March 17, 2020): 012038. http://dx.doi.org/10.1088/1757-899x/740/1/012038.

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23

Wang, C., J. J. Feng, X. Q. Luo, J. L. Lu, and G. J. Zhu. "Numerical prediction of rotating stallin a low-specific speed centrifugal pump." IOP Conference Series: Earth and Environmental Science 163 (July 30, 2018): 012091. http://dx.doi.org/10.1088/1755-1315/163/1/012091.

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24

Li, H. F., Y. W. Huo, Z. B. Pan, W. C. Zhou, and M. H. He. "Development and numerical analysis of low specific speed mixed-flow pump." IOP Conference Series: Earth and Environmental Science 15, no. 3 (November 26, 2012): 032017. http://dx.doi.org/10.1088/1755-1315/15/3/032017.

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25

Zhou, X., Y. X. Zhang, Z. L. Ji, and L. Chen. "Hydraulic design and performance analysis of low specific speed centrifugal pump." IOP Conference Series: Earth and Environmental Science 15, no. 3 (November 26, 2012): 032023. http://dx.doi.org/10.1088/1755-1315/15/3/032023.

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26

Friedrichs, Jens, and Gu¨nter Kosyna. "Rotating Cavitation in a Centrifugal Pump Impeller of Low Specific Speed." Journal of Fluids Engineering 124, no. 2 (May 28, 2002): 356–62. http://dx.doi.org/10.1115/1.1457451.

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The paper describes an experimental investigation of two similar centrifugal pump impellers of low specific speed. Both impellers show rotating cavitation over a wide range of part load operating points. The occurrence of this phenomenon produces a characteristic shape of creeping head-drop compared to the more usual sudden head-drop at “normal” operation points. The onset of rotating cavitation can be assigned to a certain value of the parameter σ/2α meaning the cavity volume in relation to the incidence angle. Optical analysis by video and high-speed camera techniques illustrates the development of this instability mechanism which is mainly driven by an interaction of the cavity closure region and the following blade. Combining these observations and the results of a fourier-transformation the characteristic propagation frequencies of rotating cavitation can be presented for one impeller.

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27

KAGAWA, Shusaku, Junichi KUROKAWA, Jun MATSUI, and Young-Do CHOI. "Performances of Very Low Specific Speed Centrifugal Pump with Circular Casing." Transactions of the Japan Society of Mechanical Engineers Series B 71, no. 707 (2005): 1821–28. http://dx.doi.org/10.1299/kikaib.71.1821.

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28

KONISHI, Takeshi, and Yasuyuki HIRANO. "Application of Rotary Porous Disks to a Low Specific Speed Pump." Proceedings of Mechanical Engineering Congress, Japan 2016 (2016): J0520406. http://dx.doi.org/10.1299/jsmemecj.2016.j0520406.

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29

Li, Wei, Wei Dong Shi, Ting Jiang, Yan Xu, and Tong Tong Li. "Analysis on Effects of the Blade Wrap Angle and Outlet Angle on the Performance of the Low-Specific Speed Centrifugal Pump." Advanced Materials Research 354-355 (October 2011): 615–20. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.615.

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In order to research the effect of the blade wrap angle and outlet angle on the hydraulic performance of the low-specific speed sewage pump, the Reynolds time-averaged Navier-Stokes equations was discretized based on the finite volume method, and the modified k-ε turbulence model were chosen in FLUENT. Numerical simulation of the internal flow within the centrifugal pump with the specific speed of 60 at different blade wrap angle and outlet angle is carried out. The analysis of the velocity and the turbulent kinetic energy distribution in different cases, and predicts the external characteristics of the several cases based on the loss analysis method. The study results show that the efficiency of pumps increase with decreasing the outlet angle and increasing the wrapping angle at the design of sewage pumps. According to the analysis, changing the blade outlet Angle has much more influence on the performance of the pump than changing the wrap angle.

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30

Chomiuk, Bartłomiej, and Janusz Skrzypacz. "Analysis of the influence of a stator type modification on the performance of a pump with a hole impeller." Open Engineering 9, no. 1 (July 20, 2019): 218–28. http://dx.doi.org/10.1515/eng-2019-0029.

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AbstractThe article presents the results of numerical analyses and experimental research of the influence of various types of stators on a liquid flow through a centrifugal pump with a hole impeller. It is a continuation of authors research of cooperation pump stators with alternative types of impellers which work in ultra low specific speed. Hole impellers have become a significant alternative to classical ones in a range of extremely low specific speed nq<10. The aim of the research is to verify the quality as well as quantity of computer modeling results, and to estimate accuracy by examining the impact of a grid and a turbulence model with which the numerical simulations reflect the actual flow.Knowledge concerning construction of hydraulic elements of centrifugal pumps working in the range of parameters corresponding specific speed (nq<10) is insufficient. The outlet elements were tested in various configurations of constructional features. The complexity of the construction of the stator can significantly affect the manufacturing costs of pump unit.

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31

Jin, Yong Xin, Wen Wu Song, and Fu Jie. "A Study on the Effects of Blade Thickness on the Performance of Low Specific Speed Centrifugal Pump." Advanced Materials Research 1070-1072 (December 2014): 1957–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1957.

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The effects of blade thickness on impeller performance is seldom considered when design the low specific speed centrifugal pump and only considered crowding coefficient when use the speed coefficient method calculate the head of the impeller was designed. It was didn't consider the fundamental relationship how leaf thickness and low specific speed centrifugal impeller performance effect each other. The three-dimensional of flow area would have large influence if the leaf thickness changes . Here the best true thickness of the low specific speed centrifugal impeller blade was obtained though study how the thickness of blade influence on the performance of low specific speed centrifugal pump.

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32

SHIRAKI, Masayoshi, and Masaaki HORIE. "Study on Low Specific Speed Centrifugal Pump in the Range of Low Reynolds Number." Proceedings of Mechanical Engineering Congress, Japan 2017 (2017): J0550102. http://dx.doi.org/10.1299/jsmemecj.2017.j0550102.

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33

Sakaguchi, Akinobu, and Masaaki Horie. "Study on Low Specific Speed Centrifugal Pump in the Range of Low Reynolds Number." Proceedings of Conference of Kansai Branch 2017.92 (2017): M709. http://dx.doi.org/10.1299/jsmekansai.2017.92.m709.

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34

SAKAGUCHI, Akinobu, and Masaaki HORIE. "Study on Low Specific Speed Centrifugal Pump in the Range of Low Reynolds Number." Proceedings of Mechanical Engineering Congress, Japan 2016 (2016): J0520403. http://dx.doi.org/10.1299/jsmemecj.2016.j0520403.

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35

Mathew, Sathyajith, K. P. Pandey, and J. D. Burton. "The Wind-driven Regenerative Water-pump." Wind Engineering 26, no. 5 (September 2002): 301–13. http://dx.doi.org/10.1260/030952402321160606.

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Roto-dynamic pumps can offer attractive performance when coupled mechanically to wind rotors in shallow lift water pumping applications. However, the gearing ratio required in the transmission for such systems restricts their commercial acceptability. This problem can be reduced by selecting a pump with a very low specific speed, so that, for a particular flow and lift, the shaft need not rotate so fast. Therefore, a regenerative pump was designed and developed for wind powered water pumping applications. A semi-empirical approach was adopted for the design. Performance of the pump was evaluated under variable operating conditions. Power-speed characteristics of the pump at different pumping heads were established and superimposed on those of a suitable wind rotor, to identify the points of operation of the integrated rotor-pump system. With optimum gearing, the peak efficiency points of the rotor and the pump could be reasonably matched over a wide range of conditions. Operating speeds of the system at different wind speeds were estimated and then translated into discharge rates and overall system efficiency. The proposed wind pumping system, with the regenerative pump, performs better on shallow lifts than either wind-driven piston or centrifugal pumping systems.

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36

Yongxue, Zhang, Zhou Xin, Ji Zhongli, and Jiang Cuiwei. "Numerical Design and Performance Prediction of Low Specific Speed Centrifugal Pump Impeller." International Journal of Fluid Machinery and Systems 4, no. 1 (March 31, 2011): 133–39. http://dx.doi.org/10.5293/ijfms.2011.4.1.133.

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37

Yang, Junhu. "CALCULATION METHOD OF THE INCREASING COEFFICIENTS FOR LOW SPECIFIC-SPEED CENTRIFUGAL PUMP." Chinese Journal of Mechanical Engineering 41, no. 04 (2005): 203. http://dx.doi.org/10.3901/jme.2005.04.203.

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38

ZHANG, Jianci. "OPTIMUM DESIGN SYSTEM OF LOW-SPECIFIC OPEN-IMPELLER HIGH-SPEED CENTRIFUGAL PUMP." Chinese Journal of Mechanical Engineering 42, no. 07 (2006): 19. http://dx.doi.org/10.3901/jme.2006.07.019.

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39

Zhu, Bing, and Hong-xun Chen. "Cavitating Suppression of Low Specific Speed Centrifugal Pump with Gap Drainage Blades." Journal of Hydrodynamics 24, no. 5 (October 2012): 729–36. http://dx.doi.org/10.1016/s1001-6058(11)60297-7.

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40

Walseth, Eve, Torbjørn Nielsen, and Bjørnar Svingen. "Measuring the Dynamic Characteristics of a Low Specific Speed Pump—Turbine Model." Energies 9, no. 3 (March 15, 2016): 199. http://dx.doi.org/10.3390/en9030199.

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41

Hankeln, Fabian, and Stefan Riedelbauch. "Investigation of hydraulic losses in a centrifugal pump with low specific speed." WASSERWIRTSCHAFT 109, S1 (September 2019): 37–41. http://dx.doi.org/10.1007/s35147-019-0232-2.

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42

Casartelli, E., O. Ryan, A. Schmid, and L. Mangani. "CFD simulation of transient startup for a low specific-speed pump-turbine." IOP Conference Series: Earth and Environmental Science 240 (March 27, 2019): 082007. http://dx.doi.org/10.1088/1755-1315/240/8/082007.

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43

Zhang, R. H., K. Zheng, L. H. Yao, and F. X. Shi. "The optimization of low specific speed centrifugal pump based on incomplete sensitivities." IOP Conference Series: Earth and Environmental Science 15, no. 3 (November 26, 2012): 032016. http://dx.doi.org/10.1088/1755-1315/15/3/032016.

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44

Wang, Y., and W. J. Wang. "Applicability of eddy viscosity turbulence models in low specific speed centrifugal pump." IOP Conference Series: Earth and Environmental Science 15, no. 6 (November 26, 2012): 062013. http://dx.doi.org/10.1088/1755-1315/15/6/062013.

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45

Wang, Cong, Yongxue Zhang, Zhiwei Li, Ao Xu, Chang Xu, and Zhicheng Shi. "Pressure fluctuation–vortex interaction in an ultra-low specific-speed centrifugal pump." Journal of Low Frequency Noise, Vibration and Active Control 38, no. 2 (December 10, 2018): 527–43. http://dx.doi.org/10.1177/1461348418817697.

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Abstract:

To provide a comprehensive understanding of the pressure fluctuation–vortex interaction in non-cavitation and cavitation flow, in this article, the unsteady flow in an ultra-low specific-speed centrifugal pump was investigated by numerical simulation. The uncertainty of the numerical framework with three sets of successively refined mesh was verified and validated by a level of 1% of the experimental results. Then, the unsteady results indicate that the features of the internal flow and the pressure fluctuation were accurately captured in accordance with the closed-loop experimental results. The detailed pressure fluctuation at 16 monitoring points and the monitoring of the vorticity suggest that some inconsistent transient phenomena in frequency spectrums show strong correlation with the evolution of vortex, such as abnormal increasing amplitudes at the monitoring points near to the leading edge on the suction surface and the trailing edge on the pressure surface in the case of lower pressurization capacity of impeller after cavitation. Further analysis applies the relative vortex transport equation to intuitionally illustrate the pressure fluctuation–vortex interaction by the contribution of baroclinic torque, viscous diffusion and vortex convection terms. It reveals that the effect of viscous diffusion is weak when the Reynolds number is much greater than 1. Pressure fluctuation amplitude enlarges on the suction side of blade near to the leading edge due to the baroclinic torque in cavitation regions, whereas the abnormal increase of pressure fluctuation after cavitation on the pressure surface of blade approaching the trailing edge results from the vortex convection during vortices moving downstream with the decrease of available net positive suction head at the same instance.

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Hongxun, C., L. Weiwei, J. Wen, and W. Peiru. "Impellers of low specific speed centrifugal pump based on the draughting technology." IOP Conference Series: Earth and Environmental Science 12 (August 1, 2010): 012018. http://dx.doi.org/10.1088/1755-1315/12/1/012018.

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47

Jia, Xiaoqi, Baoling Cui, Zuchao Zhu, and Xiaoli Yu. "Numerical investigation of pressure distribution in a low specific speed centrifugal pump." Journal of Thermal Science 27, no. 1 (January 31, 2018): 25–33. http://dx.doi.org/10.1007/s11630-018-0980-9.

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48

Wang, Cong, Yongxue Zhang, Hucan Hou, and Zhiyi Yuan. "Theory and application of two-dimension viscous hydraulic design of the ultra-low specific-speed centrifugal pump." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 1 (May 14, 2019): 58–71. http://dx.doi.org/10.1177/0957650919850420.

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Low efficiency and bad cavitation performance restrict the development of the ultra-low specific-speed centrifugal pump (ULSSCP). In this research, combined turbulent boundary layer theory with two-dimension design and two-dimension viscous hydraulic design method has been proposed to redesign a ULSSCP. Through the solution of the displacement thickness in the boundary layer, a less curved blade profile with a larger outlet angle was obtained. Then the hydraulic and cavitation performance of the reference pump and the designed pump were numerically studied. The comparison of performance of the reference pump calculated by the numerical and experimental results revealed a better agreement. Research shows that the average hydraulic efficiency and head of the designed pump improve by 2.9% and 3.3%, respectively. Besides, the designed pump has a better cavitation performance. Finally, through the internal flow analysis with entropy production diagnostic model, a 24.8% drop in head loss occurred in the designed pump.

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Li, Bowen, Xiaojun Li, Xiaoqi Jia, Feng Chen, and Hua Fang. "The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed." Processes 7, no. 9 (September 17, 2019): 625. http://dx.doi.org/10.3390/pr7090625.

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Pressure pulsations may cause high-amplitude vibrations during the process of a centrifugal pump. The trailing edge shape of the blade has a critical influence on the pump’s pressure fluctuation and hydraulic characterization. In this paper, inspired by the humpback whale flipper, the authors research the impact of applying the sinusoidal tubercles to the blade suction side of the trailing edge. Numerical calculation and experiments are carried out to investigate the impact of the trailing edge shape on the pressure pulsations and performance of a centrifugal pump with low specific speed. Two designed impellers are tested, one is a sinusoidal tubercle trailing edge (STTE) impeller and the other is the original trailing edge (OTE) prototype. The detailed study indicates that the sinusoidal tubercle trailing edge (STTE) reduces pressure pulsation and enhances hydraulic performance. In the volute tongue region, the pressure pulsation amplitudes of STTE at fBPF decrease significantly. The STTE impeller also effectively changes the vortex structure and intensity in the blade trailing edge area. This investigation will be of great benefit to the optimal design of pumps.

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Agnalt, Einar, Igor Iliev, Bjørn W. Solemslie, and Ole G. Dahlhaug. "On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines." International Journal of Rotating Machinery 2019 (March 3, 2019): 1–11. http://dx.doi.org/10.1155/2019/5375149.

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The rotor stator interaction in a low specific speed Francis model turbine and a pump-turbine is analyzed utilizing pressure sensors in the vaneless space and in the guide vane cascade. The measurements are analyzed relative to the runner angular position by utilizing an absolute encoder mounted on the shaft end. From the literature, the pressure in the analyzed area is known to be a combination of two effects: the rotating runner pressure and the throttling of the guide vane channels. The measured pressure is fitted to a mathematical pressure model to separate the two effects for two different runners. One turbine with 15+15 splitter blades and full-length blades and one pump-turbine with six blades are investigated. The blade loading on the two runners is different, giving different input for the pressure model. The main findings show that the pressure fluctuations in the guide vane cascade are mainly controlled by throttling for the low blade loading case and the rotating runner pressure for the higher blade loading case.

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