Effect of hub inclination angle on internal and external characteristics of centrifugal pump impellers
Source abstract
Abstract
The flow characteristics at a centrifugal pump impeller are significantly affected by the hub inclination angle (HIA). The large eddy simulation turbulence model is employed to simulate the centrifugal pump impeller internal flow at two HIA values under design (1.0 Qd) and off-design (0.55 Qd) conditions. The reliability of the simulation results is verified by comparing the results at a 0° impeller HIA and experimental data. The results show that an increase in HIA has a positive effect on the head of the centrifugal pump impeller, which exhibited a 5% relative deviation between HIA values of 0° and 40°. Under design conditions, there is a good and similar impeller internal flow at the two HIA values. Under off-design conditions, the relative velocity of the 40° impeller HIA channel inlet is 11.7% higher than that of the 0° impeller HIA, which reduces the flow attack angle and effectively suppresses stall. Moreover, for the 0° impeller HIA, fluctuation caused by the stall cells on the blade suction surface is observed, whereas such a phenomenon is not observed for the 40° impeller HIA.
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Research context
OpenAlex topics: Cavitation Phenomena in Pumps · Turbomachinery Performance and Optimization · Fluid Dynamics and Turbulent Flows
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University 1 , Hangzhou, Zhejiang 310018, China
Hangzhou New-Asia Cryogenic Science & Technology Co., Ltd 2 , Hangzhou, Zhejiang 310053, China
Funding
National Nature Science Foundation of China · Key Research and Development Program of Zhejiang Province
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Show source-provided references
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