Abstract
The paper reports an experimental investigation of the excitation of acoustic resonances in the annulus of a single stage axial flow compressor by periodic wake shedding from the blades. Sequences of resonances were found in which the frequencies depended on the blade configuration as well as on annulus dimensions and acoustic mode. Velocities of propagation round the annulus below the velocity of sound were found in most cases with the lowest order mode of each sequence having a velocity of propagation very close to the velocity of sound. Amplitudes of pressure fluctuation of the order of twice the relative air/blade dynamic head were recorded.
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