| Citation: | XUE Fei, LIU Wendong, QIN Yuqi, et al. A stall warning method based on fuzzy approximate entropy for a contra-rotating compressor with variable speed ratio[J]. Journal of Aerospace Power, 2026, 41（3）：20240409 doi: 10.13224/j.cnki.jasp.20240409
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Taking a low-speed and large-scale axial contra-rotating compressor as a research object, a high frequency dynamic pressure sensor array arranged at the tip of the front and rear rotors was employed to capture the flow features at different working conditions. The low-pass filtered pressure time subsequences were analyzed using the fuzzy approximate entropy algorithm. The results showed that the fuzzy approximate entropy value gradually increased as the flow coefficient decreased, indicating that the flow field at the tip of the rotor became progressively more complex. When stall occurred, there was a sharp decrease in the fuzzy approximate entropy value. It was found that the existence of the stall propagation frequency increased the deterministic component of the signal by comparing the spectrum of the dynamic pressure time series before and after the stall, which resulted in a smaller entropy value when stall occurred. By setting a stall threshold in response to the sharp decrease in entropy when stall occurred, stall warning time of 15, 14 and 26 revolutions were obtained at speed ratio equal to 0.857, 1.0 and 1.125, respectively. Finally, the effects of key parameters on the fuzzy approximate entropy results were analyzed. It was found that the parameters changed the criteria for assessing the similarity between the reconstruction vectors. However, a sharp decrease in entropy was observed in all cases when stall occurred.
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