| Citation: | XU Kunbo, CHEN Yu, TONG Fan, et al. Research on sound power and far-field directivity of fan ducted broadband noise[J]. Journal of Aerospace Power, 2023, 38（12）：3031-3042 doi: 10.13224/j.cnki.jasp.20220015
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For the fan ducted broadband noise, a two-microphone modal decomposition method was used to study the fan broadband noise modal decomposition, sound power measurement and far-field radiation characteristics. Compared with the measurement method requiring a larger number of microphone arrays, it is especially prominent in the measurement of broadband noise in high frequency pipelines. A numerical study on the effectiveness and accuracy of the method was carried out, and the accuracy of the method was verified based on the axial fan experiment. The sound power predicted by this method was in perfect agreement with the theoretical value. The experimental measurement results of fan noise showed that the two-microphone method had high accuracy in terms of sound power, and the maximum error was 3 dB. The predicted radiation directivity can accurately capture the far-field noise radiation characteristics of the fan from 20 to 60 degrees, but it should be pointed out that its prediction accuracy was very sensitive to the micro-phone spacing, and the correlation characteristics of small-spacing microphone measurements were more stable, making its prediction accuracy higher than results with larger spacing.
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