Study on suppression effect of porous material on cavity noise

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (11) : 31-37.

NING Fangli1,2, ZHANG Changtong1,2, NING Shunshan1,2, LIU Zhe1,2, WEI Juan3

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Abstract

The influence of porous material on cavity noise and cavity flow was studied at the Mach number of 0.85. Large eddy simulation (LES) was used to predict the fluid flow in the cavity. Ergun semi-empirical formula was used to predict the influence of these two parts, and LES could be combined to predict the fluid flow in porous materials. The results showed that the use of porous materials on the front wall, back wall and floor of the cavity can improve the flow field in the cavity and suppress the cavity noise; The use of porous materials in the cavity floor has the most significant effect on noise suppression of the cavity, which can reduce the total sound pressure level at the back of the cavity by more than 3dB.

Key words

porous material / cavity noise / cavity flow / Large eddy simulation / Ergun semi-empirical formula / the total sound pressure level

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NING Fangli1,2, ZHANG Changtong1,2, NING Shunshan1,2, LIU Zhe1,2, WEI Juan3. Study on suppression effect of porous material on cavity noise[J]. Journal of Vibration and Shock, 2020, 39(11): 31-37

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