多孔材料对空腔噪声抑制效果研究

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摘要研究马赫数为0.85的条件下，空腔的壁板使用多孔材料对空腔噪声和空腔流动的影响。利用大涡模拟(LES)来预测空腔内的流体流动，考虑到多孔材料对湍流的影响由渗透性损失和内部损失两部分组成,使用Ergun半经验公式来预测这两部分的影响，再结合LES湍流模型可以预测多孔材料内的流体流动。研究结果表明，空腔的前壁、后壁、底板使用多孔材料均可以改善空腔内的流场，并且可以抑制空腔噪声，其中空腔底板使用多孔材料对空腔噪声的抑制效果最为显著，可以使得空腔后部的总声压级降低3dB以上。

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	宁方立1
	2
	张畅通1
	2
	宁舜山1
	2
	刘哲1
	2
	韦娟3

关键词 ：多孔材料, 空腔噪声, 空腔流动, 大涡模拟, Ergun半经验公式, 总声压级

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

收稿日期: 2018-12-20 出版日期: 2020-05-28

引用本文:

宁方立1,2，张畅通1,2，宁舜山1,2，刘哲1,2,韦娟3. 多孔材料对空腔噪声抑制效果研究[J]. 振动与冲击, 2020, 39(11): 31-37.
NING Fangli1,2, ZHANG Changtong1,2, NING Shunshan1,2, LIU Zhe1,2, WEI Juan3. Study on suppression effect of porous material on cavity noise. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(11): 31-37.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I11/31

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