尾端扰流板厚度对圆柱杆件流场与气动噪声影响OA
Influence of Thickness of an Attached Splitter Plate on the Flow and Aerodynamic Noise Produced by a Circular Cylinder
采用谱本征正交分解方法和声比拟理论,计算分析雷诺数Re为6×104下后端设置不同厚度扰流板(长度为圆柱直径)的圆柱杆件周围流场与气动噪声特性,并与普通圆柱杆件工况进行对比.结果表明:与普通圆柱相比,扰流板削弱了类圆柱杆件表面流动分离和尾迹内大尺度交替涡脱落的形成与发展,尾迹内涡旋沿流向输运一定距离后产生振荡,波动幅度降低;随着扰流板厚度增加(5 mm增至10 mm),尾迹波动幅度与涡脱落强度进一步减弱,抑制气动力脉动和减阻效果增强.因此,圆柱后端通过合理增加扰流板厚度,可有效提升气动噪声降噪效果.
The flow behavior and flow-induced noise around a circular cylinder attached to splitter plates of different thicknesses(relative to the cylinder diameter)are investigated and compared with those of a bare circular cylinder at a Reynolds number of 6×104,using spectral proper orthogonal decomposition and acoustic analogy theory.It is found that the attached splitter plate weakens the formation of flow separation and suppresses large-scale alternating vortex shedding in the wake of cylinder-like bars.The wake begins to undulate after the vortices are transported a certain distance in the streamwise direction after which the fluctuation decreases.When the thickness of the splitter plate increases from 5 mm to 10 mm,the wake fluctuation range and vortex shedding intensity are further reduced.Moreover,the suppression of aerodynamic force fluctuations and drag reduction are enhanced.Therefore,aerodynamic noise can be effectively reduced for a circular cylinder by appropriately increasing the thickness of its attached splitter plate.
朱剑月;杨桓;程冠达;方存与;徐俊起
同济大学道路与交通工程教育部重点实验室,上海 201804||同济大学汽车与能源学院,上海 201804同济大学道路与交通工程教育部重点实验室,上海 201804同济大学汽车与能源学院,上海 201804同济大学道路与交通工程教育部重点实验室,上海 201804同济大学磁浮交通工程技术研究中心,上海 201804
数理科学
圆柱扰流板谱本征正交分解流场特性气动噪声
circular cylindersplitter platespectral proper orthogonal decompositionflow behaviouraerodynamic noise
《同济大学学报（自然科学版）》 2026 (8)
1200-1209,10
国家自然科学基金(52232013,51875411)上海市地面交通工具空气动力与热环境模拟重点实验室项目(23DZ2229029)
评论