Study of Vaneless Diffuser Rotating Stall Based on Two-Dimensional Inviscid Flow Analysis

[+] Author and Article Information
Yoshinobu Tsujimoto, Yoshiki Yoshida

Osaka University, Engineering Science, Toyonaka, Osaka, 560 Japan

Yasumasa Mori

Mitsubishi Motors Corporation, Ohta, Tokyo, 146 Japan

J. Fluids Eng 118(1), 123-127 (Mar 01, 1996) (5 pages) doi:10.1115/1.2817489 History: Received November 09, 1994; Revised July 07, 1995; Online December 04, 2007


Rotating stalls in vaneless diffusers are studied from the viewpoint that they are basically two-dimensional inviscid flow instability under the boundary conditions of vanishing velocity disturbance at the diffuser inlet and of vanishing pressure disturbance at the diffuser outlet. The linear analysis in the present report shows that the critical flow angle and the propagation velocity are functions of only the diffuser radius ratio. It is shown that the present analysis can reproduce most of the general characteristics observed in experiments: critical flow angle, propagation velocity, velocity, and pressure disturbance fields. It is shown that the vanishing velocity disturbance at the diffuser inlet is caused by the nature of impellers as a “resistance” and an “inertial resistance,” which is generally strong enough to suppress the velocity disturbance at the diffuser inlet. This explains the general experimental observations that vaneless diffuser rotating stalls are not largely affected by the impeller.

Copyright © 1996 by The American Society of Mechanical Engineers
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