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RESEARCH PAPERS

A Short Diffuser With Low Pressure Loss

[+] Author and Article Information
R. C. Adkins

Thermal Power Group, The School of Mechanical Engineering, Cranfield Institute of Technology, Cranfield, Bedfordshire, England

J. Fluids Eng 97(3), 297-302 (Sep 01, 1975) (6 pages) doi:10.1115/1.3447306 History: Received June 16, 1975; Online October 12, 2010

Abstract

A new design concept for gas turbine diffusers is presented and its potential verified by experimental data. The data were obtained from a series of research diffusers, both tubular and annular, with a range of area ratios from approximately 1.9:1 to 3.2:1 and with diffuser entry Mach number and velocity-profile distortion levels which simulated those encountered in engine systems. Measurements for all conditions tested are successfully correlated. From the correlations it is predicted that, in an engine, a pressure recovery in excess of 80 percent may be obtained with diffuser lengths only one-third that required by current design techniques, providing a bleed-off rate of approximately 3 percent of the main airflow can be tolerated at the diffuser throat. It is suggested that the bleedoff will be suitable for turbine cooling purposes.

Copyright © 1975 by ASME
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