Abstract The electrohydrodynamic (EHD) flow induced by a corona discharge has an important influence on the movement and collection of fine particles in an electrostatic precipitator. In this paper, three-dimensional particle image velocimetry (3D-PIV) is used to investigate the impact of different primary flow velocities and applied voltage on diffusion and transport of the spiked tubular electrode corona discharge EHD flow in a wide type electrostatic precipitator. In order to measure the flow characteristics of different positions of a spiked tubular electrode, the PIV measurements are carried out in several cross-sectional planes along the ESP duct. From 2D flow streamlines, in plane 1 (where the tip of the spike is oriented in the direction of primary flow), the velocity of the counter-clockwise vortex caused by the EHD flow near the plate decreases as the primary flow velocity increases. However, in plane 3 (where the tip direction is opposite to the primary flow), two vortices rotate adversely, and the flow velocity of the clockwise vortex near the plate increases as the primary flow velocity increases. Flow velocity increasing near the plate makes the particles deposited on the plate more easily to be re-entrained. It can be found in the three-dimensional analysis of the flow field that there are mainly “ascending vortex” and downward tip jet in the three observation planes. There is a discrepancy (in terms of distribution region and the magnitude of velocity) between the three-dimensional characteristics of these vortices and tip jets in the different cross-sectional planes.

中文翻译：

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宽静电除尘器中尖刺管状电极电晕放电 EHD 流的 3D-PIV 测量

摘要 电晕放电引起的电流体动力学 (EHD) 流动对静电除尘器中细颗粒的运动和收集具有重要影响。在本文中，三维粒子图像测速 (3D-PIV) 用于研究不同的初级流速和施加的电压对宽型静电除尘器中尖刺管状电极电晕放电 EHD 流的扩散和传输的影响。为了测量带刺管状电极不同位置的流动特性，PIV 测量是在沿 ESP 管道的几个横截面中进行的。根据二维流线，在平面 1（尖峰的尖端朝向主流方向），由靠近板的 EHD 流动引起的逆时针涡旋的速度随着主要流速的增加而减小。然而，在平面3（尖端方向与主流相反），两个涡旋反向旋转，板附近的顺时针涡流的流速随着主流速度的增加而增加。在板附近增加流速使得沉积在板上的颗粒更容易被重新夹带。在流场的三维分析中可以发现，三个观察平面中主要存在“上升涡”和向下尖端射流。这些涡流和尖端射流在不同截面平面的三维特征之间存在差异（在分布区域和速度大小方面）。