摘要
针对圆柱流动控制,分别设计了在圆柱前后驻点吹气、前驻点吸气后驻点吹气、前驻点吹气后驻点吸气、前后驻点吸气四种吸吹气方案。对Re=300的二维圆柱绕流无控工况、有控工况进行大涡模拟,通过对其气动力参数、表面压力分布及尾流场特性等分析比较,发现圆柱前后驻点吹气、前驻点吸气后驻点吹气两种方案由于后驻点吹出气流起到阻隔尾流旋涡的作用,能够显著抑制升力脉动。当U_(s-b)/U=1时,升力脉动减小可达到92%以上。同时发现在圆柱前驻点吹气使圆柱前端趋于流线型,正压区压力显著减小,具有显著减阻效果。
An active suction and blow method was used to the flow control of circular cylinders,including blowing at front and rear stagnation points,suctioning at front stagnation point and blowing at rear stagnation point,blowing at front stagnation point and suctioning at rear stagnation point,and suctioning at front and rear stagnation points.The control effects were simulated through Large-Eddy Simulation(LES)at a Re of 300.The results of the aerodynamics and wake flow show that blowing at rear stagnation point could suppress the fluctuation of the lift force dramatically,due to the air blowing from the stagnation point reduces the influence of the wake vortexes.The reduction rate of the lift fluctuation reaches up to 92%when Us-b/U=1.It is also found that the air blowing from front stagnation point makes the shape of the cylinder more streamlined,and the pressure in the front zone of the cylinder decreases significantly,which can lead to a significant drag reduction.
作者
陈文礼
郭艳娇
CHEN Wenli;GUO Yanjiao(Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology,Harbin Institute of Technology,Harbin 150090,China)
出处
《空气动力学学报》
CSCD
北大核心
2020年第5期989-995,I0004,共8页
Acta Aerodynamica Sinica
基金
国家自然科学基金(51722805,51978222)。
关键词
大涡模拟
主动吸吹气
流动控制
圆柱
LES
active suction and blow
flow control
circular cylinder
