新型双极电晕放电器的放电特性

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。

Characteristics of Novel Bipolar Corona Discharger

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 needle-to-plate corona discharger,bipolar corona discharger can generate higher current density and discharging power under a lower operating voltage.