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论文:2019,Vol:37,Issue(6):1148-1157 |
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引用本文： |
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王李璨, 陈荣钱, 尤延铖, 陈正武, 邱若凡. 剪切层形态对声波传播与声源定位的影响研究[J]. 西北工业大学学报 |
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WANG Lican, CHEN Rongqian, YOU Yancheng, CHEN Zhengwu, QIU Ruofan. Effects of Shear Layer Characteristics on Acoustic Propagation and Source Localization[J]. Northwestern polytechnical university |
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| 剪切层形态对声波传播与声源定位的影响研究 |
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| 王李璨1, 陈荣钱1, 尤延铖1, 陈正武2, 邱若凡1 |
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1. 厦门大学 航空航天学院, 福建 厦门 361102;
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, 四川 绵阳 621000 |
| 摘要: |
| 声学风洞开口实验段的剪切层形态对气动噪声测量及声源定位有重要影响。以平行剪切层和扩张剪切层为对象研究了剪切层的厚度、扩张角、强度等因素对声波穿过剪切层传播规律以及声源定位的影响。剪切层的流场采用自相似的速度分布来构造，声传播模拟采用带源项的线化欧拉方程，声源定位使用基于Amiet理论的波束成形技术。研究结果表明：采用高精度的数值方法可以很好模拟声波穿过剪切层产生的折射、反射等现象；剪切层厚度、扩张角和强度等的变化对使用简化对流波动方程预测的垂直入射区影响较小，对上/下游区域影响较大，这主要体现在剪切层的存在改变了声传播的相位；剪切层厚度、扩张角和强度的增加，造成声波穿过有/无厚度剪切层的声场差别增大、基于Amiet理论定位的声源相对实际声源的位置偏移量增大。 |
| 关键词:
气动声学
风洞
剪切层
折射
声源定位
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| Effects of Shear Layer Characteristics on Acoustic Propagation and Source Localization |
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| WANG Lican1, CHEN Rongqian1, YOU Yancheng1, CHEN Zhengwu2, QIU Ruofan1 |
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1. School of Aerospace Engineering, Xiamen University, Xiamen 361102, China;
2. Key Laboratory of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang 621000, China |
| Abstract: |
| The shear layer characteristics of an open-jet acoustic wind tunnel are of key importance on measurements of aeroacoustics. The effects of thickness, spreading angle and strength of shear layer on acoustic propagation and source localization are investigated through the mean/spreading shear layer with a self-similar velocity distribution. Based on the shear flow, the acoustic propagation is computed by the linearized Euler equations via a source term, and then source localization is obtained from beamforming technique combined with the theory of Amiet. Results show that the numerical method can precisely capture the refraction and reflection after sound traversing shear layer. The thickness, spreading angle and strength of the shear layer exerts little effects on the refracted region where sound wave nearly vertical incident, while mainly influence the corresponding up/downstream region in terms of phase change. Increment of thickness, spreading angle and strength of the shear layer increases the acoustic difference between the shear layer with and without thickness, and produces a larger error of source localization downstream of the actual position. |
| Key words:
aeroacoustics
wind tunnel
shear layer
refraction
source localization
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| 收稿日期: 2018-12-05
修回日期:
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| DOI: 10.1051/jnwpu/20193761148 |
| 基金项目: 国家自然科学基金（11602209）、气动噪声控制重点实验室开放课题（ANCL20180301）、福建省自然科学基金计划（2016J01029）与福建省自然科学基金（2016J06011）资助 |
| 通讯作者: 陈荣钱(1983-),厦门大学副教授,主要从事计算流体力学及飞行器气动设计研究
Email： |
| 作者简介: 王李璨(1995-),厦门大学博士研究生,主要从事计算气动声学研究。
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