基于壁面主动变形的湍流减阻控制研究  

DRAG REDUCTION CONTROL BASED ON ACTIVE WALL DEFORMATION

作　　者：葛铭纬[1,2] 许春晓[1] 黄伟希[1] 崔桂香[1] 

机构地区：[1]清华大学航天航空学院,北京100084 [2]国电联合动力技术有限公司,北京100039

出　　处：《力学学报》2012年第4期653-663,共11页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金资助项目(10925210;11002081)~~

摘　　要：采用谱方法,对反向控制下壁面主动变形的槽道湍流进行了直接数值模拟研究.结果表明,在壁面最大变形量小于5倍黏性尺度条件下,压差阻力可略,摩擦阻力降低7.6%.施加控制后,湍流强度和雷诺应力受到明显抑制,平均速度剖面对数区上移.受壁面法向运动的影响,条带结构强度减弱、尺度变大;流向涡外移且强度减弱,其倾斜和抬起的角度均有不同程度的减小.壁面变形呈现流向拉长的凹槽结构,其平均间距为90倍黏性尺度.Direct numerical simulation was performed to turbulent channel flow with active wall deformation under opposition control. It is shown that when the maximum wall displacement is limited within 5 wall units, the pressure drag is negligible and the friction drag can be reduced by 7.60/o. Under the control, the turbulence intensity and Reynolds shear stress are suppressed obviously, and the logarithmic region in mean velocity profile is moved upward. Influenced by the vertical motion of the wall, streaky structures are weakened in strength and enlarged in scale. The streamwise vortices moved further away from the wall with weakened strength, and their tilting and twisting angles are both reduced. The wall appears in the shape of streamwise elongated streaky structures with the mean spacing of 90 wall units.

关 键 词：槽道湍流 直接数值模拟 反向控制 壁面变形 湍流减阻 

分 类 号：O357.5[理学—流体力学]