基于圆柱绕流的气动声源识别方法
作者:
作者单位:

1.同济大学 上海地面交通工具风洞中心,上海201804;2.上海市地面交通工具空气动力与热环境模拟重点实验室,上海201804

作者简介:

王毅刚(1964—),男,教授,博士生导师,主要研究方向为气动噪声、噪声与振动控制。 E-mail:08024@tongji.edu.cn

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中图分类号:

U461.1

基金项目:

上海市地面交通工具空气动力与热环境模拟重点实验室科研计划(18DZ2273300)


Aerodynamic Sound Source Identification Method Based on Flow Around Cylinder
Author:
Affiliation:

1.Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai 201804, China;2.Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Shanghai 201804, China

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    摘要:

    以气流流经固体壁面产生的气动声源为研究对象,以力点源对应的偶极子气动声源声波动方程的声压解为基础,利用流场中声源辐射声压和脉动力、脉动力和压力梯度的关系,建立偶极子气动声源辐射声压与流场压力梯度的关系式;利用两偶极子声源可组成一四极子声源的概念,建立四极子气动声源辐射声压与流场脉动速度的关系式。最后,以圆柱绕流为研究对象,采用上述两关系式并结合数值仿真计算方法,得到圆柱绕流的偶极子和四极子气动声源大小和分布特征。结果表明:偶极子气动声源向远场的声辐射声压由??p?t决定,四极子气动声源向远场的声辐射声压由?2ur2?t2决定。

    Abstract:

    Taking the aerodynamic sound source generated by the airflow flowing through the solid surface as the research object, based on the acoustic wave equation’s solution of dipole sound source corresponding to the force point source, according to both the relationship between the pressure of the sound source and the pulsation force and the relationship between the pulsation force and the pressure gradient in the flow field, the relationship between the pressure of the dipole sound source and the pressure gradient in the flow field was established. Based on the concept that two dipole sound sources can form a quadrupole sound source, the relationship between the pressure of quadrupole sound source and the pulsation velocity of flow field was also established. Finally, taking the flow around cylinder as the research object, the strength and distribution of the dipole and quadrupole sound sources of the flow around cylinder were obtained with a combination of the above two equations and the numerical simulation method. It is shown that the pressure of the dipole sound source to the far field is determined by ??p?t, and the pressure of the quadrupole sound source to the far field is determined by ?2ur2?t2.

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王毅刚,朱朗贤,焦燕,张昊.基于圆柱绕流的气动声源识别方法[J].同济大学学报(自然科学版),2022,50(10):1500~1507

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  • 收稿日期:2021-07-12
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  • 在线发布日期: 2022-11-03
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