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research-article

Numerical and experimental analysis of cavitating flow in a low specific speed centrifugal pump with different surface roughness

[+] Author and Article Information
Phillip Limbach

Chair of Hydraulic Fluid Machinery, Ruhr Universität Bochum Universitätsstr. 150, 44801 Bochum, Germany
phillip.limbach@ruhr-uni-bochum.de

Romuald Skoda

Chair of Hydraulic Fluid Machinery, Ruhr Universität Bochum Universitätsstr. 150, 44801 Bochum, Germany
romuald.skoda@ruhr-uni-bochum.de

1Corresponding author.

ASME doi:10.1115/1.4036673 History: Received September 21, 2016; Revised April 18, 2017

Abstract

3D simulations with ANSYS CFX 16.1 as well as measurements of the cavitating flow in a low specific speed centrifugal pump (nq = 12 1/min) are performed for different operation conditions and varying surface roughness. Surface roughness is considered by wall functions in the flow simulations. Good agreement between measured and calculated head is achieved for non-cavitating flow. NPSH3% rises towards over load due to incidence, flow separation and vapor zones at the volute tongue. The NPSH3% rise is slightly higher for rough walls according to measurements and significantly overestimated by the wall function approach, irrespective of the roughness level in the simulation. A low-Reynolds number approach at the volute tongue leads to a more accurate prediction of NPSH3% than wall functions, at cost of high computational effort.

Copyright (c) 2017 by ASME
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