Based on the rigid wall acoustic waveguide technique, this paper carries out the research of the internal noise characteristics of a multistage axial compressor through the direct measurement of compressor′s internal noise data.Considering the good performance of wavelet analysis in time-frequency and multi-resolution domain, the analysis of the compressor′s internal noise in the axial flow component testing is successfully realized, and the wavelet analysis proves to be effective.Combining the theory of the vortex shedding of the unsteady flow and the results of the wavelet analysis, the paper proves that the internal noise of compressor is mainly caused by unsteady vortex shedding of the rotor row, and the main featured peaks of the frequency spectrum are the vortex shedding frequency and a series of special frequencies derived from the superposition of vortex shedding frequency and the BPF.At last, with different speeds, the evolution of the main peak frequency spectrums and its corresponding amplitude variations are given.The conclusions will provide certain reference for further understanding of the characteristics of unsteady flow field.
CUI Xian-zhi, SHA Yun-dong, ZHAO Feng-tong, LUAN Xiao-chi
. Investigation on internal noise characteristics of a multistage axial compressor based on wavelet analysis[J]. Journal of Shenyang Aerospace University, 2013
, 30(2)
: 32
-37
.
DOI: 10.3969/j.issn.2095-1248.2013.02.008
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