Failure Diagnosis on Gas Path of Fan/compressor Based on Acoustic Mode

doi:10.3901/JME.2019.13.038

Abstract

Abstract: The relation between efficiency of compressor/fan and acoustic mode is set forth by analysing generating mechanism of acoustic mode in the flow duct of fan/compressor, the failure diagnosis method of aero-engine's gas path based on acoustic mode is explored. On the basis of singular value decomposition(SVD) theory,a kind of taking-up method for acoustic mode sensor is put forward,and in accordance with test data processing of a type of fan tester,time sequence diagram of acoustic mode is successfully drawn, both forward acoustic mode and backward acoustic mode co-existence are distinguished during the subsonic work range of the fan by wave crest and valley distribution of acoustic mode's time sequence diagram, at the same time the fan efficiency obviously decreasing is found when backward acoustic mode is in the leading status, and design requirement is deviated, the calculation results are in good agreement with the practical failure mode, the diagnosis method of acoustic mode is feasible by verifying.

Key words: acoustic mode, aero-engine, compressorfan, failure diagnosis, singular value decomposition(SVD)

CLC Number:

TG156

CHENG Li, YANG Wukui, LIANG Tao, WEN Bi, YAO Dongye. Failure Diagnosis on Gas Path of Fan/compressor Based on Acoustic Mode[J]. Journal of Mechanical Engineering, 2019, 55(13): 38-44.

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