脉冲爆轰发动机噪声近场和远场传播研究
首发时间:2012-12-25
摘要:本文采用数值计算的方法研究了脉冲爆轰发动机噪声的传播特性。通过CE/SE方法计算得到脉冲爆轰发动机管口静压、总压及总温随时间的变化曲线,在此基础上利用大涡模拟得到了脉冲爆轰发动机近场区域的压力分布,并进一步对远场声压进行了预测,得到了轴线方向声压随轴向距离的变化关系以及脉冲爆轰发动机噪声辐射指向图。发现轴线声压在参考半径之内,声压迅速衰减,当在参考半径之外,声压衰减变慢;声压具有指向性。结果对研究脉冲爆轰发动机噪声的形成及控制方法探索具有重要的意义。
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The Study of the Noise Spread in Pulse Detonation Engine Near-field and Far-field
Abstract:This paper describes a numerical calculation method to study the propagation characteristics of the pulse detonation engine noise. Calculated pulse detonation engine nozzle static pressure, total pressure and total temperature curve over time by the CE / SE method.Calculated the pulse detonation engine pressure distribution in the near-field region by the use of large-eddy simulation . Predicted the relationship of the far-field sound pressure in the axis direction with the axial distance,and the radiation directivity pattern of pulse detonation engine noise.Found that the sound pressure decay rapid before the reference radius,decay slowly outside of the reference radius; the sound pressure has directivity.All of the simulation results provide an important reference value for research of the formation and control method in pulse detonation engine noise.
Keywords: explosion mechanics noise large eddy simulation
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