多孔材料对空腔噪声抑制效果研究  

Study on suppression effect of porous material on cavity noise

作　　者：宁方立[1,2] 张畅通 宁舜山 刘哲 韦娟 NING Fangli;ZHANG Changtong;NING Shunshan;LIU Zhe;WEI Juan(School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 710072,China;Dongguan Sanhang Military-Civil Integration Innovation Research Institute,Dongguan 523808,China;School of Communication Engineering,Xidian University,Xi'an 710071,China)

机构地区：[1]西北工业大学机电学院,西安710072 [2]东莞市三航军民融合创新研究院,东莞523808 [3]西安电子科技大学通信工程学院,西安710071

出　　处：《振动与冲击》2020年第11期31-37,44,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51675425;51375385);陕西省重点研发计划项目(2018SF-365);2018年东莞市社会科技发展(重点)项目立项(20185071021600);2020年度陕西省科技计划工业重点产业链类项目(2020ZDLGY06-09)。

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3 dB以上。Under the condition of Mach number 0.85,the effect of porous material on cavity noise and cavity flow was studied.Large Eddy Simulation(LES)was employed to predict the fluid flow in the cavity.The influence of porous material on turbulence consists of two parts which are the viscous resistance and the inertial resistance.Ergun semi-empirical equation was used to predict the influence of these two parts,and combined with LES to predict the fluid flow within the porous material.The results show that the porous material on the front wall,the rear wall and the floor of the cavity can improve the flow field in the cavity and suppress the cavity noise.When the porous material is set on the cavity floor,the most significant suppression effect on the cavity noise is obtained,which can reduce the total sound pressure level at the back of the cavity by more than 3 dB.

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 

分 类 号：TB535[理学—物理]