摘要
开口风洞中的相位传声器阵列测量,必须进行剪切层修正才能得到真实的噪声源位置信息。在0.55m×0.40m声学风洞中开展了剪切层修正的实验研究,得到了不同风速条件下的剪切层速度剖面、声波传播延迟时间和声源定位的结果。根据实验结果,对剪切层速度剖面的Gortler理论解进行了验证,并对比分析了4种剪切层修正方法。研究结果表明:选择自相似参数σ=9,ξ0=0.2时剪切层速度剖面测量值与理论值符合较好;剪切层厚度与轴向距离的关系为y=0.15x;马赫数Ma≤0.3、测量角θm在40°～140°范围内,不同剪切层修正方法对声波延迟时间计算结果的相对误差在1%以内。提出了射线追踪快速计算方法,该方法较常规射线追踪法的计算速度可提高2个数量级,从而使其适用于声阵列在线测量。
To identify the true location of the noise sources,the shear layer effect must be taking into account when conducting the microphone array test in open-jet wind tunnels.An experimental study for the shear layer correction was performed in the 0.55m×0.40m aero-acoustic tunnel of China Aerodynamics Research and Development Center(CARDC).The shear layer velocity profiles,source-receiver delay times and source identification results were obtained.The Gortler’s velocity-profile solution was validated and four different shear layer correction methods were compared and analyzed on the basis of the experimental results.The research results show that:the velocity-profile experimental data agrees well with calculations when the self-similar parametersσ=9,ξ0=0.2 are chosen,and the relationship between the fitted shear layer thickness and the axial distance data can be presented by the equation y=0.15 x;Ma≤0.3 and the measurement angleθm within 40°~140°,the relative calculation error of the delay time of different shear layer correction methods is smaller than 1%;the accuracy of the other three methods are quite close to the Amiet 2D method.A fast ray tracing method that is 100 times faster than the conventional ray tracing method is proposed,which makes the ray tracing method applicable for on-line microphone array data processing.
作者
张军
王勋年
张俊龙
卢翔宇
陈正武
Zhang Jun;Wang Xunnian;Zhang Junlong;Lu Xiangyu;Chen Zhengwu(Key Laboratory of Aerodynamics Noise Control,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China;State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China)
出处
《实验流体力学》
EI
CAS
CSCD
北大核心
2018年第4期39-46,共8页
Journal of Experiments in Fluid Mechanics
基金
国家自然科学基金(11504417)
关键词
开口风洞
声阵列
声源定位
剪切层修正
声波折射效应
open-jet wind tunnel
phased array
source localization
shear layer correction
sound refraction effect
