Straight Channel Diffuser Performance at High Inlet Mach Numbers

[+] Author and Article Information
P. W. Runstadler

Fluid Dynamics, Creare, Inc., Hanover, N. H.

R. C. Dean

Creare, Inc., Hanover, N. H.

J. Basic Eng 91(3), 397-412 (Sep 01, 1969) (16 pages) doi:10.1115/1.3571134 History: Received August 06, 1968; Online November 03, 2011


Measurements have been made of the pressure recovery of straight wall, single plane divergence diffusers with inlet Mach numbers between 0.2 and choking (0.2 ≤ Mt < 1.0). In contrast to the widely held assertion in the literature, there is no “critical” inlet subsonic Mach number above which pressure recovery decreases drastically. Two aspect ratios, AS = 0.25 and 1.0, have been studied for a range of length-to-throat-width ratios L/W1 and divergence angles 2θ around the regions of peak recovery. Diffuser performance maps are given showing pressure recovery Cp as a function of diffuser geometry for fixed values of throat Mach number Mt , throat blockage B, and aspect ratio AS. Significant changes in the location and magnitude of pressure recovery do occur with variations in Mt , B, and AS. The importance to the designer of a knowledge of how diffuser performance depends upon geometric and diffuser inlet parameters is discussed.

Copyright © 1969 by ASME
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