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RESEARCH PAPERS

Theoretical Study of Pressure Fluctuations Downstream of a Diffuser Pump Impeller—Part 1: Fundamental Analysis on Rotor-Stator Interaction

[+] Author and Article Information
W. Qin

Yonago Factory, Awamura Manufacturing Co., Ltd., Yomi-cho, Yonago, 683, Japan

H. Tsukamoto

Kyushu Institute of Technology, Tobata, Kitakyushu, 804, Japan

J. Fluids Eng 119(3), 647-652 (Sep 01, 1997) (6 pages) doi:10.1115/1.2819293 History: Received May 18, 1996; Revised February 18, 1997; Online December 04, 2007

Abstract

A theoretical method was developed to calculate the unsteady flow caused by the interaction between impeller and diffuser vanes in a diffuser pump by using the singularity method. The unsteady flow in the diffuser vane is assumed to be induced by three kinds of unsteady vortices: bound vortices distributed on the impeller blades and diffuser vanes, and free vortices shed from the trailing edge of diffuser vanes. In order to make clear the contribution of each harmonic component of unsteady vortices to unsteady pressure, all the unsteady vortices are expressed in the form of Fourier series. The calculated unsteady pressures downstream of impeller agree well with the corresponding measured ones. Moreover, it was shown that impulsive pressure plays a predominant role for unsteady pressures.

Copyright © 1997 by The American Society of Mechanical Engineers
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