CAJ | 학술논문

为了研究产生于Laval喷管中的一种新型滑动电弧放电的物理特性,研究了不同流量工作气体（空气）条件下产生的等离子体电弧的伏安特性,并利用高速摄影仪对此种新型等离子体的滑动电弧发展过程进行了跟踪,记录了滑动电弧等离子体击穿—延长—电弧最大—熄灭的循环过程。结果表明：随着工作气体流量的增加,电极电压波形出现突变的频率越来越高;电流波形随着气体流量的增加除了击穿时突变点增多外大致形状不变,近似于正弦波形,且最大值都为0.4A;半周期内的平均电压在629～1 347V范围内变化。分析得出,流量变化对这种滑动电弧放电的伏安特性,特别是电压特性存在剧烈影响,这一点也可以从高速摄影所得图像中看出。
위료연구산생우Laval분관중적일충신형활동전호방전적물리특성,연구료불동류량공작기체（공기）조건하산생적등리자체전호적복안특성,병이용고속섭영의대차충신형등리자체적활동전호발전과정진행료근종,기록료활동전호등리자체격천—연장—전호최대—식멸적순배과정。결과표명：수착공작기체류량적증가,전겁전압파형출현돌변적빈솔월래월고;전류파형수착기체류량적증가제료격천시돌변점증다외대치형상불변,근사우정현파형,차최대치도위0.4A;반주기내적평균전압재629～1 347V범위내변화。분석득출,류량변화대저충활동전호방전적복안특성,특별시전압특성존재극렬영향,저일점야가이종고속섭영소득도상중간출。
In order to study the physical characteristics of a new type of gliding arc discharge plasma generated in a Laval nozzle, we studied its voltage-ampere （V-A） characteristics and movement under various flow rates of working gas（air）. In order to analyze the developing process of photographic apparatus to track and record the physical the gliding arc discharge plasma, we applied high-speed cycles of ＂gliding arc breaking down--lengtheningmthe largest arc lengthening--extinguishing＂. The results show that frequency of mutations of the electrode voltage waveform becomes much higher with the increasing flow rate of working gas. Waveform of the current is generally stable which is similar to sine waveform, except that current mutations increase with the increasing flow rate in the breakdown condition. The maximum value of sine waveform is 0.4 A. The average voltage in half a cycle is from 629 to1347 V, and its changing trend is like the power capacity. It can be seen from the analysis that changing of flow rate influences the V-A characteristics severely, especially the voltage characteristics, and this can also be seen from the Voltage-Ampere obtained by the high-speed photographic instrument.