DBD等离子体非定常激励下的平板流场结构分布研究

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。

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

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.