叶顶间隙对低比转数半开式离心泵性能的影响

doi:10.3969/j.issn.1674-8530.2012.03.008

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Abstract In order to analyze the effects of tip clearance on the flow and performance of low specific speed highspeed centrifugal pump with a semiopen impeller, the inner flow field in a pump with the specific speed ns=19.3 was numerically simulated based on the Navier-Stokes equations and the Spalart-Allmaras turbulence model at the tip clearances 0.5, 1.1 and 2.5 mm. The performance of the centrifugal pump was measured as well.The results show that the flow in the impeller is improved with a bigger clearance, but the hydraulic loss caused from the circular flow in the impeller at a relatively big clearance is larger than that at a more tight clearance, so the head and efficiency were decreased with increasing tip clearance. Also, the relative velocity and static pressure of fluid in the clearance were reduced at the middle and trailing edge of blade with increasing tip clearance, especially the relative velocity. The static pressure shows a nearly linear relation to radius. The tangential and radial velocity along the axial direction in the impeller passages were lowered with increasing clearance. Comparison of the results simulated with the experimental data suggests CFD method is quite able to simulate a change in the performance due to varying tip clearance.

Key words： centrifugal pump low specific speed semi open impeller tip clearance numerical simulation

Received: 25 August 2011 Published: 10 April 2012

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	Articles by authors
	CUI Bao-Ling
	HUANG Da-Gang
	SHI Pei-Qi
	JIN Qing-Ming

Cite this article:

CUI Bao-Ling,HUANG Da-Gang,SHI Pei-Qi等. Effect of tip clearance on performance of low specific speed centrifugal pump with semiopen impeller[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(3): 283-288.

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http://zzs.ujs.edu.cn/pgjx/EN/10.3969/j.issn.1674-8530.2012.03.008 OR http://zzs.ujs.edu.cn/pgjx/EN/Y2012/V30/I3/283

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