MVG控制斜激波/湍流边界层干涉的大涡模拟  

Large-eddy simulation of MVG controlled oblique shockwave/turbulent boundary layer interaction

作　　者：杨光 方剑[1,2] 陆利蓬 姚宇峰[3] 刘超群 YANG Guang;FANG Jian;LU Lipeng;YAO Yufeng;LIU Chaoqun(National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;Computer Science and Engineering Department,Daresbury Laboratory,Science and Technology Facilities Council of United Kingdom,Warrington WA4 4AD,United Kingdo;Department of Engineering Design and Mathematics,University of the West of England,Bristol BS16 1OY,United Kingdom;Department of Mathematics,University of Texas at Arlington,Arlington TX 76019-0408,United States)

机构地区：[1]北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室,北京100191 [2]英国学技术设备评议会Daresbury实验室计算机科学与工程部,英国沃灵顿WA44AD [3]西英格兰大学数学与工程设计系,英国布里斯托BS161QY [4]得克萨斯大学阿灵顿分校数学系,美国阿灵顿TX76019-0408

出　　处：《航空动力学报》2018年第7期1639-1646,共8页Journal of Aerospace Power

基　　金：国家自然科学基金(11302012,11572025,51420105008,51476004); 英国湍流协会基金(EP/L000261/1)

摘　　要：采用浸没边界法(IBM)对带有微型涡发生器(MVG)控制器的激波/湍流边界层干涉流动进行了大涡模拟(LES)。以来流马赫数为2.3的斜激波(由平板上方8°楔产生)为基本流动入射平板湍流边界层,通过在干涉区前布置MVG阵列来控制激波诱导的边界层分离。采用浸没边界法处理MVG的复杂几何,分析了MVG尾迹区平均流速度剖面,雷诺应力,瞬态旋涡结构。结果表明:时均流场显示MVG尾迹区存在一对对转的主流向涡,流向涡加剧了边界内的动量交换从而增加了边界层抗分离能力,而瞬态流场则反映出MVG尾迹区的剪切层由于Kelvin-Helmholtz(K-H)不稳定性会卷起为一列展向旋涡。A large-eddy simulation（LES）combined with immersed boundary method（IBM）of a micro vortex generator（MVG）controlled shockwave boundary layer interaction flow was carried out.The base flow was represented by the interaction of an oblique shockwave（generated by 8° wedge above flat plate）and a spatially-developing Mach number of 2.3 turbulent boundary layer.A MVG array was deposited before the interaction region to control the shock-induced boundary layer separation.A ghost-point immersed boundary method combined with Cartesian grid was adopted to deal with the geometrical singularity of MVG.Time-averaged streamwise velocity,Reynolds shear stress,instantaneous vortical structures in the MVG wake region were analyzed in detail.Time-averaged flowfield showed that there was a counter-rotating primary streamwise vortex in the MVG wake,whose momentum transportation increased the boundary layer ability to resist separation.The instantaneous flowfield revealed that the shear-layer in the MVG wake could roll-up to a trail of spanwise vortex ring/arc through Kelvin-Helmholtz（K-H）instability

关 键 词：激波/边界层干涉(SBLI) 流动控制 大涡模拟(LES) 浸没边界法(IBM) 

分 类 号：V19[航空宇航科学与技术—人机与环境工程]