Effect of the shape change of cavity on aerodynamic noise suppression
NING Shunshan1, ZHANG Qian2, XIAO Wei1, LI Zhencai1, NING Fangli3, YANG Linsen1
1. Research Institute of Sichuan Aerospace System Engineering, China Aerospace Science and Technology Corporation, Chengdu 610100,China；
2. The 29th Research Institute, China Electronic Technology Group Corporation, Chengdu 610036,China;
3. School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072,China
Abstract：Aiming at the problem of cavity noise, in order to further explore the effect of cavity shape change on cavity noise suppression, Large Eddy Simulation (LES) and Computational Aeroacoustics (CAA) are used to simulate typical cavity. It is found that with the increase of β, the Sound Pressure Level (SPL) of the main mode of the cavity noise decreases in the 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 the lower frequency part when β increases 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.
宁舜山1，张倩2，肖伟1，李振才1，宁方立3，杨林森1. 形状变化对空腔噪声的抑制效果[J]. 振动与冲击, 2021, 40(22): 209-215.
NING Shunshan1, ZHANG Qian2, XIAO Wei1, LI Zhencai1, NING Fangli3, YANG Linsen1. Effect of the shape change of cavity on aerodynamic noise suppression. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(22): 209-215.
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