矩形超声速射流激波啸叫模态特性实验研究  

Experimental study on mode characteristics of screech tone by rectangular supersonic jet

作　　者：张俊龙[1] 覃晨 王海涛 赵佳锡 ZHANG Junlong;QIN Chen;WANG Haitao;ZHAO Jiaxi(Key Laboratory of Aerodynamic Noise Control,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China;School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China)

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,四川绵阳621000 [2]湖南科技大学机电工程学院,湖南湘潭411201

出　　处：《航空动力学报》2025年第2期1-12,共12页Journal of Aerospace Power

摘　　要：针对圆形及宽高比分别为1、1.5、2、10的4种矩形收缩喷管的超声速射流激波啸叫噪声的周向模态特性开展了实验测量研究。所有喷口具有相同的出口面积,并在同一射流模拟装置中进行,射流为冷喷流。研究在喷口出口近场区域周向等角度布置12个传声器,采用短时互功率谱分析方法和短时滤波声能分析方法分别获得超声速欠膨胀射流激波啸叫相位及幅值的周向角分布情况。研究表明:宽高比为1的矩形超声速欠膨胀射流的模态特性与圆形射流基本一致,而宽高比大于1的矩形射流模态特性与圆形射流差异较大。低马赫数下,圆形和宽高比为1的矩形射流表现出稳定的轴对称模态,而宽高比大于1的矩形射流表现出不稳定的模态特征;较高马赫数下,圆形和宽高比为1的矩形射流表现出不稳定的螺旋或摆动模态,而宽高比大于1的矩形射流表现出稳定的沿短轴方向的摆动模态。The azimuthal mode characteristics of supersonic jet screech tone noise were studied for four converging rectangular jets of aspect ratios 1,1.5,2 and 10 and a round nozzle.All five nozzles had the same exit area and were tested in the same jet simulator facility on unheated conditions.Twelve microphones were arranged at equal azimuthal angles in the near-field of the nozzle outlet.The azimuthal angular distribution of the phase and amplitude of the screech tone of supersonic under expanded jet was obtained using the short-time cross power spectrum analysis method and the short-time filtered sound energy analysis method.It was found that the mode characteristics of rectangular supersonic underexpanded jet with aspect ratio of 1 were basically consistent with those of circular jet,while the mode characteristics of rectangular jet with aspect ratio greater than 1 were quite different from those of circular jet.At low Mach number,circular and rectangular jets with aspect ratio 1 showed stable axisymmetric modes,while rectangular jets with aspect ratio greater than 1 showed unstable mode characteristics.At higher Mach numbers,circular and rectangular jets with aspect ratio 1 exhibited unstable helical or oscillating modes,while rectangular jets with aspect ratio greater than 1 exhibited stable oscillating modes along the minor axis.

关 键 词：超声速射流 射流噪声 矩形射流 激波啸叫 模态特性 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程] O358[理学—流体力学] O422.2[理学—力学]