后端设置扰流板对圆柱流场与气动噪声影响

doi:10.3901/JME.2024.12.287

机械工程学报 ›› 2024, Vol. 60 ›› Issue (12): 287-300.doi: 10.3901/JME.2024.12.287

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后端设置扰流板对圆柱流场与气动噪声影响

朱剑月^1,2, 袁咏祎^1,2, 陈羽², 徐俊起³

1. 同济大学铁道与城市轨道交通研究院上海 201804;
2. 同济大学汽车学院上海 201804;
3. 同济大学磁浮交通工程技术研究中心上海 201804

收稿日期:2023-06-30 修回日期:2024-02-10 出版日期:2024-06-20 发布日期:2024-08-23
作者简介:朱剑月,男,1973年出生,博士,副教授,博士研究生导师。主要研究方向为高速列车空气动力学与气动噪声。E-mail:zhujianyue@tongji.edu.cn;陈羽(通信作者),男,1986年出生,博士,讲师,硕士研究生导师。主要研究方向为列车空气动力学。E-mail:chen.yu@tongji.edu.cn
基金资助:
新能源汽车及动力系统国家工程研究中心、国家自然科学基金(52232013，51875411)和上海市地面交通工具空气动力与热环境模拟重点实验室资助项目。

Influence of Attached Splitter Plate on the Flow and Flow-induced Noise Generated from Circular Cylinder

ZHU Jianyue^1,2, YUAN Yongyi^1,2, CHEN Yu², XU Junqi³

1. Institute of Rail Transit, Tongji University, Shanghai 201804;
2. School of Automobile, Tongji University, Shanghai 201804;
3. Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804

Received:2023-06-30 Revised:2024-02-10 Online:2024-06-20 Published:2024-08-23

摘要/Abstract

摘要： 采用延迟分离涡模型进行数值模拟，基于涡声理论和声类比方法，计算分析雷诺数Re=6×10⁴下后端设置不同长度扰流板(不大于圆柱直径)的圆柱杆件周围流场与气动噪声特性，并与具有相同特征长度的普通圆柱杆件工况进行对比。圆柱杆件远场气动噪声计算值与声学风洞测试结果的频谱曲线吻合良好，验证数值模拟的准确性。结果表明，圆柱后端加设扰流板后，流动分离形成的涡脱落发展被限制在扰流板两侧，使得类圆柱杆件尾迹内分离剪切层长度增加，涡运动耗散增强，近壁面涡旋波动强度和尾迹内规则涡脱落强度减弱，降低几何体周围近场四极子气动噪声源强度，同时减小类圆柱杆件气动力脉动和阻力平均值，降低涡脱落诱发气动噪声的谐频峰值，有效降低远场偶极子噪声的声压级幅值，取得较好的气动噪声降噪效果。

关键词: 圆柱, 扰流板, 气动噪声, 流场特性, 噪声控制

Abstract: The characteristics of flow and aerodynamic noise generated around a circular cylinder using an attached splitter plate with different lengths (no more than cylinder diameter) have been studied and compared with the circular cylinder case of the same characteristic dimensions at a Reynolds number of 6×10⁴ based on the theory of vortex sound and acoustic analogy approach after the flow is simulated using the delayed detached-eddy model. The calculated spectra of far-field aerodynamic noise agree well with the anechoic wind-tunnel experiments for the circular cylinder case, verifying the accuracy of the numerical simulations. Results show that the developing of the vortex shedding induced from the flow separations is limited along two sides of the splitter plate after it is attached at the rear of the cylinder. The separated shear layer developed in the wake of cylindrical bars is elongated and the dissipation of vortex motion is strengthened. The vortex undulation close to the walls and regular vortex shedding in the wake are mitigated. Thus the strength of near-field quadrupole sound source is reduced. Meanwhile the aerodynamic force fluctuation and mean drag are decreased. Consequently the harmonic peak values of flow-induced noise generated from the vortex shedding are reduced effectively and the corresponding amplitude of sound pressure level of far-field dipole sound source is decreased. Thereby a good aerodynamic noise reduction effect is achieved for a circular cylinder with an attached splitter plate.

Key words: circular cylinder, splitter plate, aerodynamic noise, flow behaviour, noise control

中图分类号:

O355

朱剑月, 袁咏祎, 陈羽, 徐俊起. 后端设置扰流板对圆柱流场与气动噪声影响[J]. 机械工程学报, 2024, 60(12): 287-300.

ZHU Jianyue, YUAN Yongyi, CHEN Yu, XU Junqi. Influence of Attached Splitter Plate on the Flow and Flow-induced Noise Generated from Circular Cylinder[J]. Journal of Mechanical Engineering, 2024, 60(12): 287-300.

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后端设置扰流板对圆柱流场与气动噪声影响

Influence of Attached Splitter Plate on the Flow and Flow-induced Noise Generated from Circular Cylinder

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