新型双极电晕放电器的放电特性

Characteristics of Novel Bipolar Corona Discharger

为了得到放电参数更好的电晕放电器,解决传统电晕放电器在施加单极性高压电源时只在高压电极上放电,而接地极上并不放电的情况,采用了一种新型针—针式结构的双极电晕放电器,在施加单极性高压电源时,放电器内能同时在高压电极和接地电极产生正、负两种不同极性的电晕放电。实验研究直流高压与脉冲高压下新型双极电晕放电器的伏安特性、放电现象和离子风时,在平均场强约3.4kV/cm条件下采用粒子图像测速仪(PIV)测得电场内正、负离子风的核心区风速约2m/s。与针—板式电晕放电器相比,新型双极电晕放电器的工作电压降低,而输出功率和电流密度明显提高。

In order to find a corona discharger with better discharge parameters, and solve the problem of exiting corona discharger which can not generate corona on plate-electrode but only on high-voltage-electrode, A bipolar corona discharger is applied to generate positive and negative corona discharge by connecting with unipolar high voltage power supply, by contrast, existing corona dischargers can only generate unipolar corona. Voltage-current characteristics, discharging phenomenon and ionic wind of bipolar corona discharger are experimentally carried out. The positive and the negative ion wind velocities in core area are about 2m/s when the distance between the opposite electrodes is 100mm at the voltage of 3.4kV measured by a Particle Image Velocimetry （PIV）. Compared with needleto-plate corona discharger, bipolar corona discharger can generate higher current density and discharging power under a lower operating voltage.