矩形射流激波啸叫机理实验研究  

Experimental investigation of screech tone mechanism in supersonic rectangular jet

作　　者：张俊龙[1] 覃晨 赵佳锡 ZHANG Junlong;QIN Chen;ZHAO Jiaxi(Key Laboratory of Aerodynamic Noise Control,China Aerodynamics Research and Development Center Mianyang 621000)

机构地区：[1]中国空气动力研究与发展中心气动噪声控制重点实验室,绵阳621000

出　　处：《声学学报》2024年第5期1083-1090,共8页Acta Acustica

基　　金：国家自然科学基金项目(12234015)资助。

摘　　要：为了解超声速欠膨胀射流激波啸叫噪声的产生机理,基于宽高比10∶1的矩形收缩喷管射流模拟实验装置,采用远场噪声测试及近场流动纹影测量相结合的方法,研究了超声速射流激波格栅结构的非定常运动规律,及其与大尺度旋涡相互作用产生啸叫噪声的过程。实验结果表明不同方位激波啸叫噪声的产生机制存在差异,射流上游和侧边方向的激波啸叫主要是由大尺度旋涡与激波格栅尖梢相互作用而形成的弧形脉冲声波,而下游方向的激波啸叫噪声主要由马赫波辐射引起。实验探究了超声速射流激波格栅结构的非定常运动激发激波啸叫弧形脉冲波的过程,并采用高斯调制的弧形脉冲序列对激波啸叫噪声进行模拟。结果表明,激波啸叫弧形脉冲声波的离散性质以及多声源机制会导致高阶激波啸叫噪声的产生。To investigate the mechanism of screech tone generated by supersonic underexpansion jet,a rectangular contraction nozzle jet simulation experimental device with an aspect ratio of 10∶1 was used.A combination of far-field noise testing and nearfield flow schlieren measurement was used to study the unsteady motion of the supersonic jet shock cell structures and its interaction with large-scale vortices to generate screech tones.The experimental results show that there are different generation mechanisms for screech tones in the upstream direction and downstream direction.The screech tones in the upstream and side directions of the jet are mainly the arc-shaped pulse wave formed by the interaction between the large-scale vortices and the shock cell tips,while the screech tones in the downstream direction are mainly caused by Mach wave radiation.The experiment revealed the unsteady motion law of the shock cell structures in supersonic jet flow,and discovered the arc-shaped pulse wave property of screech tones.In addition,the Gaussian-modulated sinusoidal pulse train has been used to simulate the arc shaped pulse waves and the results showed that the pulse nature of screech tones and the multi-source mechanism can lead to the generation of higher-order screech tones.

关 键 词：射流噪声 矩形射流 激波啸叫 高速纹影 

分 类 号：TB53[理学—物理]