Numerical simulation of radiated noise during combustion of energetic materials in a closed bomb  

作　　者：Shi-hui Xiong Tuo Yang Yu-jun Wu Jing-cheng Wang Yuan Li Yu-quan Wen 

机构地区：[1]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing,100081,China [2]Xi'an Qinghua Cooperation,North Special Energy Group Co.,Ltd.,Xi'an,710025,China [3]Institute of Extreme Mechanics and School of Aeronautics,Northwestern Polytechnical University,Xi'an,710072,China

出　　处：《Defence Technology（防务技术）》2022年第7期1167-1178,共12页Defence Technology

摘　　要：In this study,based on a closed bomb test combined with computational fluid dynamics,a structural finite element method,and an acoustic boundary element method,a fluid-solid acoustic one-way coupling calculation model is established for the combustion process of energetic materials in a closed bomb,and the effectiveness of the model is verified by experiments.It is found that the maximum peak sound pressure increases exponentially with an increase in loading doses or gas pressure.However,a change in the combustion coefficient of the energetic materials has little effect on the noise generated during the combustion process in the closed bomb.When the combustion coefficient is reduced by a multiple of 16,the maximum transient sound pressure is reduced by 1.79 dB,and the sound pressure level in the frequency band is reduced by 1.75 dB.With an increase in shell thickness,the combustion noise of the energetic materials in the closed bomb decreases,and the reduction range of the combustion noise increases with the increase in shell thickness.

关 键 词：PYROTECHNICS Noise Energetic materials Fluid-structure interaction Acoustic boundary element 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程]