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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 47, 2020 Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v35.i3.60
pages 287-298

Unsteady Flow in the Volute of a Centrifugal Pump with Large Blade Exit Angle

Wen-Guang Li
Department of Fluid Machinery, Lanzhou University of Technology, 730050, Lanzhou, China

Краткое описание

The unsteady flows in three sections of the volute with rectangular section were mapped by using LDV at both best efficiency and part-loading points respectively while pumping water. The pump is a single-stage, cantilevered centrifugal pump, its impeller is in a closed configuration and the blade outlet angle is 44°. The results show that the fluid velocity fluctuates periodically with the impeller angular positions with respect to a measurement point where the flow was investigated. As increase in the distance from impeller outlet, the velocity damps rapidly and its periodical fluctuation is suppressed. The magnitude of the fluctuation is about 0.2−0.7 of the averaged velocity and decreases with the increase in the distance. The fluctuation magnitude in the flow angle seems larger than that in velocity by 1 − 2 order. The more the measurement point closes to the tongue of volute, the larger the fluctuation in both velocity and flow angle becomes. The averaged velocity declines with increase in the distance from the impeller outlet. However, the averaged flow angle rises at first, then decreases. The liquid angular moment is not conservational and the flow is not axisymmetrical as well in the volute.