两种电极结构下电除尘器中的电流体动力学流动

采用数值计算方法同时模拟了平板和波形板电极结构电除尘器中的电流体动力学(EHD)流动图谱,以分析电晕放电产生的离子风对主流流动和粒子捕集的干扰效应.结果表明,波形板与平板型收尘极通道中的耦合流动形态不同,但两种通道流动过程中二次流涡旋的产生和消散均强烈依赖于主流平均流速的大小.相同电气条件下,两种电极结构中导致涡旋消散的临界平均流速亦不相同.此外,气流对收尘极板表面的冲刷作用可能由离子风与主流平均流速共同决定.

Electrohydrodynamic Flow in Electrostatic Precipitators of Two Different Electrode Systems

The characteristics of electrohydrodynamic (EHD) flow in two model geometries of electrostatic precipitators are simulated directly by employing computational fluid dynamic method over a range of operating conditions, the momentum coupling between ionic wind and the mean flows are analyzed for estimating the effect of the phenomena on particle collection, and the flat plate and zigzag plate are considered as collecting plates, respectively. The results show that the features of EHD flows in the two configurations are different from each other, but the occurring and dissipating of secondary flows are sensitively depend on the magnitudes of the mean flow velocities in both of the two structures. The critical velocities of the mean stream are not the same in the two configurations, and the flow sweeping intensities on the plates are dominated by both of the ionic wind and mean flow velocities.