形状变化对空腔噪声的抑制效果  

Effect of the shape change of cavity on aerodynamic noise suppression

作　　者：宁舜山 张倩 肖伟 李振才 宁方立[3] 杨林森 NING Shunshan;ZHANG Qian;XIAO Wei;LI Zhencai;NING Fangli;YANG Linsen(Research Institute of Sichuan Aerospace System Engineering,China Aerospace Science and Technology Corporation,Chengdu 610100,China;The 29th Research Institute,China Electronic Technology Group Corporation,Chengdu 610036,China;School of Mechanical Engineering,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]中国航天科技集团有限公司四川航天系统工程研究所,成都610100 [2]中国电子科技集团公司第二十九研究所,成都610036 [3]西北工业大学机电学院,西安710072

出　　处：《振动与冲击》2021年第22期209-215,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51675425,51375385)。

摘　　要：针对空腔噪声问题,为进一步探究空腔形状变化对空腔噪声的抑制效果,采用大涡模拟与计算气动声学相结合的方法对典型空腔结构进行数值仿真研究。研究发现,随着空腔前壁倾斜角β的增大,空腔噪声主模态声压级整体呈下降趋势,但两者并非线性关系,并且空腔噪声总声压级也会随之降低。此外,当空腔前壁倾斜角β增大至一定值时,空腔噪声主模态频率会大幅向低频部分移动。空腔噪声主模态声压级和总声压级的降低以及主模态频率的大幅移动会有效改善空腔内的强噪声环境,避免空腔结构及腔内武器装备发生声疲劳破坏。Aiming at the cavity noise,in order to further explore the effect of the cavity shape change on cavity noise suppression,large eddy simulation(LES)and computational aeroacoustics(CAA)were used to simulate a typical cavity structure.It is found that with the increase of the slant angle of front wallβ,the sound pressure level(SPL)of the main mode of the cavity noise decreases in an overall trend,but the relationship between them is not linear,and the overall sound pressure level(OASPL)of the cavity noise also decreases.In addition,the frequency of the main mode of the cavity noise will move to a lower frequency band whenβincreases to a certain value.The reduction of the main mode SPL and OASPL of the cavity noise and the jump movement of the main mode frequency will effectively improve the strong noise environment in the cavity and avoid the acoustic fatigue damage of the cavity structure and the weapon equipment in the cavity.

关 键 词：空腔噪声 声压级(SPL) 总声压级(OASPL) 前壁倾斜角 噪声控制 

分 类 号：TB535[理学—物理]