The paper “Criteria for Spike Initiated Rotating Stall” by Vo et al. (2008, ASME J. Turbomach., 130, p. 011023) provides a very important contribution to the understanding of spike-type stall inception in axial-flow compressors by demonstrating that spike-type disturbances are directly linked to the tip leakage flow of the rotor. The computational study of Vo et al. leads to the conclusion that two conditions have to be fulfilled simultaneously for the formation of spike-type stall: (i) axial backflow at the leading edge plane and (ii) axial backflow at the trailing edge plane. The objective of the present technical brief is to support these findings by corresponding experimental results.
This paper describes the experimental investigations of high-frequency pressure oscillations in a single-stage axial-flow low-speed compressor during rotating stall where the main oscillating frequency is greater than that of rotor rotation and less than or equal (o that of the blade passing frequency. These oscillations are similar to the high-frequency oscillation processes in the flow of multi-stage axial-flow high-speed compressors and low-speed single-stage axial fans described in earlier literature.
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