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Effect of blade number on internal energy flow loss of centrifugal pump
Published:2024-06-27 author:SU Yonghong, YIN Jiu, ZHANG Jie. Browse: 485 Check PDF documents
Effect of blade number on internal energy flow loss of centrifugal pump


SU Yonghong1, YIN Jiu2, ZHANG Jie3


(1.College of Science, Engineering and Agricultural Medicine, Shanxi Open University, Taiyuan 030024, China; 2.School of 

Mechanical and Electrical Engineering,Hubei Light Industry Technology Institute, Wuhan 430070, China; 

3.School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China)


Abstract: Aiming at the problem that improper number of blades of centrifugal pump will reduce the efficiency of fluid delivery and make the performance of centrifugal pump difficult to improve, the influence of blade number on the flow energy loss in centrifugal pump was studied. Firstly, the fluid domain model of centrifugal pump with 4, 5 and 6 blades was established by UG, and the fluid domain of centrifugal pump with each blade number was divided into hexahedral structured grids. Then, ANSYS Fluent was used to compute the head, efficiency and shaft power of the centrifugal pump with different blade numbers under the flow rate of 0.6~1.4 times of the rated flow. The entropy generation theory was used to study the values and proportion of entropy generation caused by direct dissipation (EGDD), entropy generation caused by turbulence dissipation (EGTD) and entropy generation caused by wall shear stress (EGWS) for different blade numbers at different flow rates. Finally, the entropy generation value (EGV) of the inlet, outlet, impeller and volute domains were studied, and the spatial distribution of the entropy generation rate (EGR) was also studied. The results show that the more the number of blades is, the larger the pump head, efficiency and shaft power are. The entropy generation value at rated flow is the lowest. The entropy generation value of impeller domain accounts for the largest proportion, followed by that of volute domain. The entropy generation rate in the viscous wake region is large, and the entropy generation caused by wall shear stress at the trailing edge of the blade pressure surface is the highest.

Key words: centrifugal pump; entropy production theory; entropy generation caused by direct dissipation(EGDD); entropy generation caused by turbulence dissipation(EGTD); entropy generation caused by wall shear stress(EGWS); entropy generation value(EGV); entropy generation rate(EGR)
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