| Citation: | YANG Fan, WU Yanhui, QIAN Kun, et al. Experiment on intermittent rotating instability based on wavelet transform analysis[J]. Journal of Aerospace Power, 2025, 40（5）：20230576 doi: 10.13224/j.cnki.jasp.20230576
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A subsonic axial compressor isolated rotor test rig was taken as the research object to explore the time-frequency characteristics and physical nature of rotational instability (RI) through measurement of unsteady pressure at the blade tip region. Using the power spectrum estimation, the spatial distribution and frequency characteristics of RI were studied, indicating that the frequency characteristics and spatial distribution of RI did not change with the blade tip clearance size, rotating speed and mass flow rate. Using wavelet transform to study the time-frequency characteristics of RI, it was found that RI was not continuous in time. The increase of blade tip clearance would increase the occurrence frequency of RI. The time-frequency characteristics of RI were simulated by artificial signals, and the hypothesis that RI would only appear on specific blades was verified. The pressure field on the tip of the blade showed that the physical nature of RI was represented by a two-channel flow structure with alternating high and low loading formed by the tip leakage vortex breakdown.
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