Numerical simulation of three-dimensional electrohydrodynamics of spiked-electrode electrostatic precipitators
Numerical simulation of three-dimensional electrohydrodynamics of spiked-electrode electrostatic precipitators
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DOI：
10.1109/tdei.2006.1593414
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发表时间：
2006-02-01
影响因子：
3.1
通讯作者：
Yamamoto, T
中科院分区：
文献类型：
--
作者：
Fujishima, H;Morita, Y;Yamamoto, T
线道式电除尘器(ESP)中簇状/点状电晕的一次流和二次流(通常称为电风或离子风)之间的三维流动相互作用已有研究。这项研究进一步扩展到工业电除尘器常用的线板式电极上的交替定向点电晕。没有气体流动的二次流分布是由一对长椭圆形的环流单元组成的，这些环流单元位于沿导线的尖点之间。而尖峰点之间的流动旋转方向是相同的，这与点电晕电极相反。流动相互作用用无因次数N(EHD)来描述，N(EHD)是离子风速与一次流速度之比。当一次流存在时，沿底板间气流方向形成一对长椭圆形螺旋流。当尖峰间距与线板间距的相对距离(或S(Z)/d之比)大于0.17时，形成有组织的长椭圆螺旋流。当S(Z)/d小于0.1时，有组织的螺旋流减弱，产生湍流。
The three-dimensional flow interaction between the primary flow and the secondary flow (often called an electric wind or ionic wind) for tuft/point corona in the wire-duct type electrostatic precipitators (ESPs) has been investigated in the past. This study was further extended to incorporate the alternately oriented point corona on the wire-plate type electrodes, which are commonly used for the industrial ESPs. The secondary flow distribution without gas flow consists of a pair of long-elliptic and circulatory cells between spikes points along the wire. However, the flow rotation between spiked points is the same direction, which is opposite to that of the point corona electrode. The flow interaction is described using dimensionless number, N(EHD), which is the ratio of the ionic wind velocity to the primary flow velocity. When the primary flow exists, a pair of long-elliptic spiral flows is formed in the direction of the gas flow between ground plates. When the relative distance between the spike point spacing and the wire-to-plate spacing (or the ratio of S(z)/d) is greater than 0.17, the organized long-elliptic spiral flow is formed. When S(z)/d is less than 0.1, the organized spiral flow is diminished, resulting in turbulence.