Low-speed cavity noise control tests based on microphone array

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (5) : 267-272.

MA Ruixuan1,2, LI Zhengchu1, SONG Yubao1, WANG Xunnian1,2

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Abstract

The primary noise sources distribution of the low-speed cavity flow is measured in the aeroacoustic wind tunnel using the phase microphone array, with which a new method for evaluating the intensity of aerodynamic sound sources is proposed. The suppression strategy of cavity noise is explored by installing sawtooth panel and straight panel on the front and rear edges of the cavity, and the noise reduction effects of different measures are compared. The results show that the low-speed cavity flow noise mainly comes from the interaction between the shear layer and the rear edge of the cavity. The sawtooth panel installed along the incoming flow direction on the front edge has the best effect on cavity noise control. Furthermore, the denser the sawteeth, the better it works for the noise suppression. The effect of the straight panel on cavity noise control is not ideal.

Key words

phase microphone array / cavity flow / wind tunnel test / noise suppression

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MA Ruixuan1,2, LI Zhengchu1, SONG Yubao1, WANG Xunnian1,2. Low-speed cavity noise control tests based on microphone array[J]. Journal of Vibration and Shock, 2022, 41(5): 267-272

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