| Citation: | WANG Daqing, TONG Fan, FENG Heying, et al. Influence of pitch diameter protruding structure on interference noise of tandem double cylinders[J]. Journal of Aerospace Power, 2023, 38（1）：160-172 doi: 10.13224/j.cnki.jasp.20210421
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In order to explore the noise reduction effect and noise reduction law of the periodic pitch diameter protruding structure on the interference noise of the tandem double cylinders bluff body, noise reduction experiments of tandem double cylinders were carried out in the 0.55 m×0.4 m anechoic wind tunnel. Eight kinds of periodic pitch diameter protruding structures with different parameters were designed, and the noise reduction effects of pitch diameter periodic protruding structure on the interference noise of the tandem double cylinders were tested at four incoming flow velocities (Reynolds number 0.4×105−1.6×105). Experiment results showed that, the tone peak noise can be reduced or even be completely suppressed by the periodic pitch diameter protruding structure. The maximum peak noise reduction can reach nearly 30 dB, and the maximum overall sound pressure level noise reduction can reach 18.1 dB. Under different working conditions, different structures had different noise suppression capability and there was an optimal value for each working condition. Generally speaking, periodic pitch diameter protruding structure with protruding height of (0.1
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