用于流体边界层控制的电磁场计算

Simulation of Electromagnetic Fields on Flow Boundary Layer Control

利用电磁场作用于电介质溶液的Lorentz力可以控制溶液的流动。基于电磁场的基本方程,利用有限差分法,对置入流动弱电解质中圆柱形电磁激活板周围的电势、磁势、电场强度、磁场强度和Lorentz力进行了数值模拟,并对其分布做了分析。结果表明:电势、磁势、电场强度、磁场强度和Lorentz力沿展向均呈周期分布,沿法向则以指数规律迅速衰减。极板宽度越宽,衰减越慢,渗透深度越大,Lorentz力脉动性越小。

It is possible to control the flow in the electrolyte solution by Lorentz forces generated by the suitably chosen magnetic and electric fields. Based on electromagnetic equations, the electromagnetic fields induced by a cylindrical actuator in a low-conducting moving electrolyte, the voltage, the magnetic, the intensity of electric field, the intensity of magnetic field and the Lorentz forces are investigated numerically with finite differential algorithm. The distributions are analyzed. The result shows the distribution of the voltage, the magnetic, the intensity of electric field, the intensity of magnetic field and the Lorentz force are periodic in spanwise direction, and are exponential attenuation in normal direction. The wider the actuator is, the slower the attenuation is, and the deeper the effective depth is, the weaker the fluctuation of the Lorentz forces is.