圆柱绕流的边界层及其电磁控制

利用电介质溶液中圆柱体侧表面附近分布的电磁产生电磁力,作用于流体边界层,达到控制圆柱绕流的目的。在层流模式下(Re<150),采用极坐标系中NavierStokes方程的涡量-流函数形式,对置于弱电介质溶液中包覆电磁场激活板的圆柱绕流的尾迹和边界层的速度分布进行了数值研究。涡量传输方程采用ADI(隐式交替)格式,流函数方程采用FFT(快速傅里叶变换)格式,计算结果具有二阶空间精度和一阶时间精度,作了相应的实验,对实验结果进行了分析和讨论。

Boundary Layer of Flow Around Cylinder and Its Electromagnetic Control

The electromagnetic forces generated by the electromagnetic field and localized around the circular cylinder surface are used to modify the boundary layer of flow and to control the flow field structure of the circular cylinder flow. The circular cylinder are covered with electromagnetic actuators and located in electrolyte solution at low Renaults (Re<150). Based on the vorticity-stream function formulation of the Navier-Stokes equations, and by adopting the exponential-polar coordinates, the numerical investigations on the wake of cylinder and the velocity distribution of the boundary are performed. The Alternative-Direction Implicit algorithm for the vorticity transport equation, and the Fast Fourier Transform algorithm for the stream function equation are used with the accuracy of second order in space and first order in time. The corresponding experiments are carried out and their results are analyzed.