科研之友
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摘要
To analyze the fan noise of an aviation engine, spectrum characteristic and circular modal characteristic for forward noise of the scaled fan at different rotational speeds were investigated experimentally. And noise reduction performance of the acoustic liner was also verified. Results indicate that the frequency spectrum and circular mode decomposition results of the measured data meet the theory of rotor-stator interference. The tonal noise becomes larger with the rotational speed increasing, which amounts about 85% of forward fan noise energy at the high rotational speed. For the cases studied in this paper, the acoustic liner has significant effect for the target blade passing frequency and mode, and its optimal transmission loss of 59dB for the dominant mode can be achieved at 85% rotational speed. Also, the acoustic liner has certain broadband noise reduction characteristic, average transmission loss of broadband noise obtained by the acoustic liner is about 3dB at 85% rotational speed.
