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兵工学报  2015 

脉冲爆轰发动机爆轰噪声场区域划分及其数值模拟

DOI: 10.3969/j.issn.1000-1093.2015.10.005, PP. 1855-1860

Keywords: 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

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Abstract:

?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33dB/m;在弱非线性区,最小衰减速度为1.02dB/m.模拟结果对PDE爆轰噪声的传播特性研究具有参考价值。

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