摘要
为研究三爆轰管脉冲爆轰发动机噪声的形成机理和特性,设计了正三角形组合的三爆轰管PDE实验系统,分别在与中心轴线成0°、30°、60°及90°方向上,对8个不同距离处的声压进行了测量,结果表明:不同距离处噪声幅值最大值均在30°方向上;爆轰噪声的参考半径为3倍"名义管径";爆轰噪声的A持续时间随着r(距离三爆轰管名义"中点"的直线距离)的增加近似线性减小,并随着角度的增大而减小。B持续时间与声压值的大小成反比关系,并且随着轴向距离的增加而增加。在不同的方位角上,峰值声压越大,B持续时间越小。
In the present work,a testing system consisting of three detonation tubes was designed in a regular triangle to investigate the noise characteristics of a three-tube PDE system and their formation mechanism.The distance between each tube and the central axis is 200 mm.The directivity of acoustic emissions is measured using a circular array of four transducers（0°,30°,60°,and 90°）at various radial distances.Results show that all the max peak pressures appear in the directivity of 30°.The referential radius of the detonation noise is three times that of the＂nominal tube diameter＂.The duration of A time decreases almost linearly along with the increase of r（the distance to the nominal＂central point＂of the three detonation tubes）,and also decreases with the increase of the angle.The duration of B time is inversely proportional to the noise amplitude,and increases with the increase of the axial distance.At different angles,the greater the peak pressure,the smaller the duration of B time.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2016年第5期633-639,共7页
Explosion and Shock Waves
基金
国家自然科学基金项目(11472138)
中央高校基本科研业务费专项基金项目(30920130112007)
国防预研究基金项目
关键词
爆炸力学
爆轰噪声
参考半径
脉冲爆轰发动机
指向性
持续时间
mechanics of explosion
detonation noise
reference radius
pulse detonation engine
directivity
time of duration
作者简介
第一作者：黄孝龙（1988-），男，博士研究生，huang_xl@foxmail．com。
