线-板结构离子风发生器强化通道内对流换热的数值研究

离子风发生器是利用电晕放电引起空气流动的一种装置。利用COMSOL Multiphysics软件建立了基于线-板电极结构离子风发生器的计算模型,对离子风发生器强化通道内对流换热的能力开展了数值模拟研究。针对入口风速、发射极电压、初速度方向以及电极水平间距这4个关键因素进行研究,分析了4种因素对强化换热效果的影响。模拟结果表明:在入口风速较小时,离子风对换热的强化效果更好;当发射极电压较高,离子风射流和主流方向相反时,离子风的扰动作用更剧烈,对换热过程有更加显著的增强作用。而电极水平间距则存在最优值,可以使换热效果达到最优。

Numerical Study on Convective Heat Transfer Enhancement in a Channel by a Wire-Plate Ionic Generator

Ionic wind generator is a device which can induce air flow by corona discharge. In order to investigate the heat transfer enhancement capacity of the wire-plate ionic generator, a numerical model was developed in COMSOL Multiphysics. The inlet velocity, applied voltage, initial velocity direction and horizontal distance between electrodes were selected as vital factors in investigation and the influence of them on heat transfer enhancement was analyzed numerically. The simulation results show that the heat transfer enhancement performance of ionic wind generator is greater when inlet velocity is slow. When applied voltage is high and the ironic wind velocity is opposite to the inlet velocity is , the disturbance of the ionic wind is more intense and the heat transfer is obviously enhanced. Numerical results show that the horizontal distance between electrodes has an optimal value for obtaining best heat transfer performance.