排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2012, Vol. 30 Issue (2): 171-175    DOI: 10.3969/j.issn.1674-8530.2012.02.010
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Cavitation performance research of mixedflow pump based on CFD
 CHANG  Shu-Ping, WANG  Yong-Sheng
(College of Naval Architecture and Marine Power, Naval University of Engineering, Wuhan, Hubei 430033, China)
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Abstract The cavitating flow in a mixedflow pump under the design working condition was simulated numerically with the SST turbulence model and homogeneous mixture cavitation model based on the Rayleigh-Plesset equations by solving the timeaveraged Navier-Stokes equations.  The NPSHH curve was extracted from the results, the cavitation inception and development were captured as well. The features of vapour volume fraction distribution in the impeller were comparatively analyzed under the slight, critical and severe cavitation conditions. The results show that this pump has met the requirement on its cavitation performance. A cavity appears firstly on the blade suction surface near the leading edge and the shroud, as NPSH is reduced, it extends towards the hub and trailing edge.The tip cavity originates from the blade leading edge and develops into a strip along a blade contour on the shroud. The hub cavity accumulates near the blade trailing edge on the hub, further the vapour volume fraction on the hub is evidently larger than on the shroud. A similar cavity distribution is indentified in all the impeller passages, and the serious blockage due to cavity in the flow passages results in a sharp reduction in pump head under the sever cavitation condition.
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CHANG Shu-Ping
WANG Yong-Sheng
Key wordsmixedflow pump   impeller   cavitation   computational fluid dynamics   numerical simulation     
Received: 2011-09-05; Published: 2012-03-30
Cite this article:   
CHANG Shu-Ping,WANG Yong-Sheng. Cavitation performance research of mixedflow pump based on CFD[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(2): 171-175.
 
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