大气压氩气纳秒脉冲针—水结构气液放电特性研究

A nanosecond pulse power supply is employed to drive a needle-water structure gas-liquid discharge in atmospheric pressure argon，in order to improve the plasma activity in a relatively stable discharge mode. The electrical characteristics，images and optical emission spectra of the discharge at different pulse voltages and frequencies are studied. The reasons for the influence of the relevant parameters on the discharge characteristics are discussed. The results show that in the nanosecond pulsed gas-liquid discharge in argon，the pulse voltage and frequency will not affect the discharge mode. As the pulse voltage increases，both the current at the rising and falling edge and average power in a duty cycle increase，and the current at the rising edge is always greater than that at the falling edge. When the pulse frequency increases，the current at the rising edge and average power increase，and the current at the falling edge decreases. As for plasma characteristics，Ar（4p→4s），H_α（656 nm）and O（777 nm）lines with a high intensity and H_β（486 nm）lines with a low intensity are measured at different pulse voltages and frequencies，and all the intensity of emission spectra increases with the increase of pulse voltage and frequency.