电除尘器内电晕放电流体场的数值模拟

Numerical Simulation on Electrohydraulic Field about Corona Discharge in ESP

在静电除尘器电晕放电场中,电晕放电将空气中原子、分子电离,并将小颗粒荷电,在电场和其他附加场的作用下形成电流体流动.在阴极电晕放电下,阴离子向阳极移动,最终离开电晕区.在电晕区外。阴离子朝收尘极运动,沿途不断撞击中性气体分子.通过这种碰撞,动量从离子传递给了中性气体分子,从而引起越来越强的气体运动.因此,就形成了电场、离子流场、带电气体粒子气流场相互作用的电流体场。讨论如何用FEMLAB软件建立平板型电除尘器内电流体场理论模型。利用三种应用模式建立耦合方程系统,并选择恰当的边界条件:在离子漂移区(电晕外区),应用静电模型描述空间电势;应用PDE方程系数模型描述电荷流动;利用不可压缩Navier-Stokes模型描述流体运动。

In the corona discharge field of ESE corona discharge ionizing air atoms, molecules, and charged particles in the effects of the electric field or other additional field, electrohydraulic flow was to be formed. Corona dischargd in the cathode, anion moved to the anode, and left the corona area eventually. Outside of the corona region, anion moved to collect electrode. Along the route, neutral gas molecules were collided continuously. In this collision, momentum was transferred from ion to the neutral gas molecules, which led to more gas motion. Therefore, the interaction of the electric field and ion flow field charged particles of gas flow field to form the electrohydraulic field. This article will discuss how to establish the electrohydraulic field theory model of the plate ESP using FEMLAB software. Three application modes are used to solve the system of coupled equations with appropriate boundary conditions： in ion drift zone （outside the corona region）, application of electrostatic model describes the space potential; Application of PDE equations coefficient model states the flow of charge; The use of incompressible Navier-Stokes model for fluid movement.