亚声速矩形射流的噪声辐射特性和声源分布  

Noise radiation characteristics and source distribution of subsonic rectangular jet

作　　者：张俊龙 雷红胜 田昊[2] 李杰[1] ZHANG Junlong;LEI Hongsheng;TIAN Hao;LI Jie(School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China;Key Laboratory of Aerodynamic Noise Control,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]西北工业大学航空学院,西安710072 [2]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：《航空学报》2020年第2期127-136,共10页Acta Aeronautica et Astronautica Sinica

摘　　要：基于射流噪声模拟试验台,对出口面积相同的圆形喷口及宽高比分别为1、1.5、2、10的矩形喷口亚声速射流的远场噪声辐射特性和噪声源分布位置进行了较为系统的研究。通过远场噪声测量,获得了不同宽高比矩形喷口在不同方位角平面的射流噪声频谱分布结果相对于圆形射流的差异,揭示了矩形射流潜在的降噪潜力。通过基于波束成形算法的传声器阵列,得到了矩形射流噪声源峰值位置随频率的变化情况,系统分析了射流速度、方位角、宽高比等参数对矩形射流噪声源分布的影响。射流速度和方位角对矩形射流噪声源分布的归一化结果影响很小,而宽高比对矩形射流噪声源分布有较大影响:随着矩形宽高比的增加,矩形射流低频段噪声源向上游偏移,高频段噪声源向下游偏移。The far-field radiation characteristic and the noise source distribution of rectangular jet with aspect ratios 1,1.5,2,10are measured based on the jet noise simulator and the results are analyzed.The differences of the far-field noise frequency spectrum at specified azimuth plane between the round jet and the rectangular jet with different aspect ratios are presented,which shows the noise reduction potential of the rectangular nozzles.The changing of jet noise peak location with frequency of rectangular jet is obtained through the microphone array with beamforming algorithm.The influences of jet velocity,azimuth angle,and aspect ratio on the rectangular jet noise source distribution are systematically analyzed.The jet velocity and azimuth angle have little effect on the normalized jet noise source distribution,whereas the aspect ratio has a large impact.With the increase of the aspect ratio,the low frequency noise peak of rectangular jet moves upstream,and the high frequency noise peak moves downstream.

关 键 词：射流噪声 矩形射流 传声器阵列 波束成形 噪声源分布 远场噪声测量 

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]