开口风洞声阵列测量的剪切层修正方法 |
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引用本文: | 张军,王勋年,张俊龙,卢翔宇,陈正武. 开口风洞声阵列测量的剪切层修正方法[J]. 实验流体力学, 2018, 32(4): 39-46. DOI: 10.11729/syltlx20180013 |
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作者姓名: | 张军 王勋年 张俊龙 卢翔宇 陈正武 |
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作者单位: | 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 |
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基金项目: | 国家自然科学基金11504417 |
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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。
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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 |
收稿时间: | 2017-12-25 |
Shear layer correction methods for open-jet wind tunnel phased array test |
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Affiliation: | 1.Key Laboratory of Aerodynamics Noise Control, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China2.State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China |
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Abstract: | 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 parameters σ=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=0.15x; Ma ≤ 0.3 and the measurement angle θm 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. |
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