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The effect of very low axial clearances on the performance of an axial-flow compressor stage
Published online by Cambridge University Press: 20 April 2006
Abstract
The results of tests on an axial-flow compressor stage designed to allow operation at unusually low axial clearances are presented. The axial clearance was varied between 1 and 33 % of the blade chord whilst the compressor was running, and the stage pressure rise showed a peak at a clearance around 4 % of blade chord. The pressure rise was 8 % higher at this clearance than at 33 % of chord, with no significant change in the stage efficiency. In addition, reducing the clearance was found under some conditions to bring the stage from a stalled to a fully unstalled state. The sound output of the stage was measured at all clearances, and the results show a significant increase in the high harmonics of the blade-passing frequency at low axial clearances.
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- © 1985 Cambridge University Press
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