线板放电电流体的实验研究与数值模拟

Experimental research and numerical simulation of electro-hydrodynamic in wire-plate discharge channel

为了分析不同极配形式下放电场中离子风的运动状态,采用实验分析和数值模拟的方法,并结合相关电流体理论进行分析,确立了离子风起始电压的概念;得出了极板处离子风速、电晕线处离子风速和放电电压之间的关系;建立了线板式放电仿真模型,并采用动力风代替离子风的方法对放电通道内的离子风进行了数值模拟,阐述了离子风速模拟值与实测风速值、理论风速值产生误差的原因.模拟结果显示,电晕放电过程中离子风在放电通道内呈双螺旋结构分布.上述结论将对放电空间物质间相互作用的研究提供必要的理论指导.

The motion state of ion wind in discharge channel is analyzed for different discharge configurations by experimental method and numerical simulation, as well as analysis on electro-hydrodynamic theory. The conception of inception voltage of ion wind is proposed; the velocity of ion wind is obtained near the plate electrode and that near the wire as functions of the applied voltage. A model to simulate wire-plate discharge is established and the ion wind is simulated in discharge channel by this model through replacing the ion wind by the dynamic wind. Furthermore, the reason is given to explain the error between the simulated velocity and experimental one and that between simulated velocity and theoretical one. The simulated results also show that a double-helix structure distribution of ion wind exists in the discharge channel. The results provide a necessary theoretical support for the research on the interactions between different kinds of materials in discharge channel.