Abstract
An experiment was carried out in a low-speed large-scale axial-compressor. Dynamic pressure signals were measured and analyzed with a wavelet transform. At all stable operating condition, a shaft order perturbation was observed from the dynamic pressure signals and wavelet power spectrums. By measuring the tip clearance, blade pitches and blade thickness distributions, a rotor asymmetry was identified in this compressor, which is strongly linked to the shaft order perturbation. Modal wave appears at the near-stall operating point. The propagation speed of the modal wave is about 20% rotating speed. At the peak of the modal wave, the intensity of the shaft-order-perturbation increases obviously, while it decays very fast at the trough of modal wave. By throttling the compressor, modal stall occurs in several seconds and only one stall-cell was detected. The stall cell grows smoothly out of the modal wave and its propagation speed is increased to 30% rotor speed. In several revolutions before stall, the intensity of the modal wave is increasing and a shaft order perturbation produced by modal-wave grows into stall inception which indicate stall onset but not trigger stall.
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This work is funded by the National Natural Science Foundation of China, Grant No. 51161130525, 51136003, and the 111 Project, No. B07009.
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He, X., Ma, H., Zhang, J. et al. Wavelet analysis of the shaft order perturbation and stall inception in an axial compressor. J. Therm. Sci. 22, 223–228 (2013). https://doi.org/10.1007/s11630-013-0616-z
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DOI: https://doi.org/10.1007/s11630-013-0616-z