Effects of Wall Shape on Flow Regimes and Performance in Straight, Two-Dimensional Diffusers

[+] Author and Article Information
J. J. Carlson

University of Nevada, Reno, Nev.

J. P. Johnston

Stanford University, Stanford, Calif.

C. J. Sagi

Research Laboratories, General Motors Corp., Warren, Mich.

J. Basic Eng 89(1), 151-159 (Mar 01, 1967) (9 pages) doi:10.1115/1.3609545 History: Received January 18, 1966; Online November 03, 2011


Three diffuser sets (N/W1 , held constant in each set) were built and tested for performance and flow regime over a range of total area ratios, AR, which yielded unstalled and stalled flows. At each AR and N/W1 , a simple class of convex-inward (trumpet-shaped), straight, and convex-outward (bell-shaped) wall shapes were tested. It is concluded that there is little advantage to be gained by contouring the walls of two-dimensional diffusers. A corollary result shows that the performance prediction method of reference [1] gives good results for unstalled diffusers.

Copyright © 1967 by ASME
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