Turbulence and Unsteadiness Measurements Downstream of a Moving Blade Row

[+] Author and Article Information
R. L. Evans

S.R.C. Turbomachinery Lab., Cambridge University, Cambridge, England

J. Eng. Power 97(1), 131-137 (Jan 01, 1975) (7 pages) doi:10.1115/1.3445892 History: Received November 27, 1973; Online July 14, 2010


Turbulence and unsteadiness levels downstream of an axial-flow compressor rotor have been measured using an ensemble-averaging technique. Free-stream turbulence levels are lowest near the compressor design-point, and increase with decreasing flow coefficient as the compressor nears the stalled condition. The unsteady stator incidence angles have been found to have a peak-to-peak variation of between 12 deg and 15 deg for all flow coefficients tested. These observations have been confirmed qualitatively by hot-wire-anemometer spectral measurements.

Copyright © 1975 by ASME
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