DBD等离子体非定常激励下的平板流场结构分布研究  

Numerical study of flow structure over a flat plate actuated by unsteady DBD plasma

作　　者：吴延龙 马玉伟 俞建阳 WU Yanlong;MA Yuwei;YU Jianyang(China Academy of Space Technology,Beijing 100094,China;Beijing Institute of Spacecraft System Engineering,Beijing 100094,China;School of Astronautics,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]中国空间技术研究院,北京100094 [2]北京空间飞行器总体设计部,北京100094 [3]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《航天器环境工程》2018年第4期336-341,共6页Spacecraft Environment Engineering

摘　　要：文章采用DBD等离子体简化模型,基于大涡模拟方法,对DBD等离子体作用下的流场进行数值模拟研究,探讨等离子体非定常激励作用下平板流动的流场结构特点。结果表明:等离子体作用下,在近壁区形成了一系列的正负涡对结构,涡对的产生促进了近壁区内流体与主流流体的能量交换,时均结果表现为从等离子体作用点形成向下游发展的壁面射流;在等离子体作用点下游0.5b的位置,等离子体最大诱导速度UDBD随激励强度Dc呈指数形式增加。In the present work,the dielectric-barrier-discharge(DBD)plasma actuator is employed to study the flow structures over a flat plat.A simplified DBD plasma model is established by treating the plasma effect as the body force to be implemented into the Navier-Stokes equations and solved by the large eddy simulation(LES)method.The results show that a series of vortex pairs in the dipole formation and in a periodic distribution are generated in the boundary layer as soon as the DBD plasma actuator is applied to the flow over a flat plane.They enhance the momentum transfer between the near wall region and the free stream.At the location of x=0.5b downstream the actuator,the maximum induced velocity is found to follow a power-increased law for the actuation strength applied.

关 键 词：介质阻挡放电等离子体 流动控制 简化模型 大涡模拟 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]