Effect of Geometry on the Performance of Radial Vaneless Diffusers

[+] Author and Article Information
Yingkang Zhu, S. A. Sjolander

Department of Mechanical and Aeronautical Engineering, Carleton University, Ottawa, Canada K1S 5B6

J. Turbomach 109(4), 550-556 (Oct 01, 1987) (7 pages) doi:10.1115/1.3262147 History: Received February 17, 1987; Online November 09, 2009


The paper presents measurements of the steady aerodynamic characteristics of a series of five radial vaneless diffusers with walls varying from mildly divergent to strongly convergent. The static pressure recovery was determined and the flow was traversed at the inlet and the outlet of the diffuser for a broad range of flow rates in each case. It was found that wall convergence results in a negative (stabilizing) slope in the pressure rise curve for the diffuser. Furthermore, at high flow rates convergence was found to reduce the pressure recovery far less than one would expect and at intermediate flow rates convergence actually improved the pressure recovery. The better-than-expected performance is thought to be closely related to the observed improvement in the flow uniformity at the diffuser outlet when convergent walls are used.

Copyright © 1987 by ASME
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