脉冲爆轰发动机爆轰噪声场区域划分及其数值模拟  

The Classification and Numerical Calculation of Noise Propagation outside Pulse Detonation Engine

作　　者：黄孝龙[1] 许桂阳 翁春生[1] 李宁[1] 

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《兵工学报》2015年第10期1855-1860,共6页Acta Armamentarii

基　　金：国家自然科学基金项目(11472138);中央高校基本科研业务专项资金项目(30920130112007);国防预先研究基金项目(9140C300202120C30)

摘　　要：为了探究脉冲爆轰发动机(PDE)爆轰噪声的传播机理,根据爆轰噪声不同的非线性强度,将PDE爆轰噪声传播区域划分成强非线性区、弱非线性区和线性区3个部分,并分别采用不同的方法对各部分所对应的3种不同控制方程进行求解。数值模拟结果表明:爆轰噪声峰值声压级在出口处迅速衰减,随着轴向距离的增加,衰减速度逐渐放缓;在强非线性区,衰减速度最大值可达33 d B/m;在弱非线性区,最小衰减速度为1.02 d B/m.模拟结果对PDE爆轰噪声的传播特性研究具有参考价值。The propagation of detonation noise is divided into three regions based on the nonlinear intensity to explore the mechanism of the noise propagation out of pulse detonation engine（ PDE）,which are strongly nonlinear region,weak nonlinear region and linear region. Three methods are used to solve the corresponding control equations. The calculated result shows that the detonation noise amplitude decays quickly at the jet. The rate of decay decreases with the increase in radial distance. The largest rate of decay is 33 d B / m in the strongly nonlinear region while the least rate of decay is 1. 02 d B / m in the weak nonlinear region. The results are of great significance for studying the mechanism of detonation noise.

关 键 词：兵器科学与技术 脉冲爆轰发动机 爆轰噪声 衰减规律 数值模拟 

分 类 号：V231.22[航空宇航科学与技术—航空宇航推进理论与工程]