利用顶部脉冲吸气控制三维方形棱柱气动力  

Control of the aerodynamic forces of a 3 D square prism with free-end pulsing suction

作　　者：邓国浩 王汉封[1,2] 赵崇宇 尹亚鹏 DENG Guohao;WANG Hanfeng;ZHAO Chongyu;YIN Yapeng(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Laboratory for High-speed Railway Construction Technology,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2023年第4期1407-1415,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52078505)。

摘　　要：通过风洞实验研究三维柱体顶部前沿狭缝脉冲吸气对其气动力与尾流的控制效果。实验模型为高宽比H/d=5的方柱,均匀来流速度U∞=10 m/s,雷诺数Re=27000,狭缝入口吸气速度与来流风速相同。研究结果表明:相对于无控制工况,脉冲吸气对柱体气动力有明显抑制作用;当脉冲吸气系数f*=0.2时,脉冲吸气与定常吸气对柱体气动力的抑制效果相当;随f*增大,柱体阻力与脉动升力仍有所减小,但减小幅度有限;顶部脉冲吸气不仅能明显削弱柱体顶部附近气动力,而且对柱体中下部气动力抑制效果比定常吸气对柱体气动力抑制效果好;顶部脉冲吸气在自由端剪切流中形成周期性大尺度涡结构,增强了自由流与尾流动量交换。The control effect of a pulsing suction at the free-end leading edge on the aerodynamic force and near wake of a 3D cylinder was experimentally studied.The tested model is a square cylinder with the aspect ratio H/d=5.The results show that the oncoming flow velocity U∞=10 m/s,corresponding to a Reynolds number Re=27000.The suction velocity at the slot is the same as U∞.Compared with the uncontrolled case,the pulsing suction reduces the aerodynamic forces of the cylinder significantly.When the pulsing suction coefficient f*=0.2,the effect of pulsing suction control is approximately equivalent to that of steady suction.With the increase of f*,the mean drag and fluctuating lift reduce gradually,but the reduction is limited.The pulsing suction can not only reduce the aerodynamic force near the top of the cylinder,but also has better control effect in the middle and lower part of the cylinder.The top pulsing suction forms periodic large-scale vortex structure in the shear flow over the free end,which enhances the momentum exchange between the free flow and the wake.

关 键 词：风洞实验 三维柱体 脉冲吸气 剪切流 主动控制 

分 类 号：O355[理学—流体力学]