Experimental Investigation of the Flow in Diffusers Behind an Axial Flow Compressor

[+] Author and Article Information
T. Zierer

Gas Turbine Development, ABB Power Generation Limited, Baden, Switzerland

J. Turbomach 117(2), 231-239 (Apr 01, 1995) (9 pages) doi:10.1115/1.2835651 History: Received March 17, 1993; Online January 29, 2008


The flow fields of four diffusers situated at the rear of a one-stage axial flow compressor were experimentally investigated. Through modification of the compressor operating point, a wide range of variations of the side wall boundary layers and the radial velocity distribution outside of the boundary layers at diffuser inlet could be achieved. The three-dimensional flow field at both diffuser inlet and outlet is analyzed. Changes of inlet blockage and radial velocity distribution and their resulting effects on pressure recovery are thoroughly presented. Compared with the results of measurements at diffusers, typically with ducted flow inlet conditions, higher values of pressure recovery are observed. Established design rules, based on investigations of diffusers with carefully developed inlet flow, are checked regarding their applicability for diffusers in turbomachine environments.

Copyright © 1995 by The American Society of Mechanical Engineers
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