Characteristics of nanosecond-pulse atmospheric pressure plasma jet
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摘要: 采用单针式电极，使用单极性重复频率脉冲电源，在常压氦气、氩气、氮气和空气中得到等离子体射流，并改变电压、流量和气体种类，分别观察不同的实验条件对等离子体射流的影响。实验结果表明：射流长度随施加电压的增加而增长；随着流量的连续变化，射流长度先逐渐变长，达到峰值后由于湍流影响，长度又逐渐缩短，达到一定流量后趋于饱和。此外，不同工作气体中的等离子体射流呈现截然不同的外观，氦气和氩气中射流呈针状模式，长度可达7 cm以上；而在氮气和空气中，射流呈现为长度不超过2 cm的刷状模式。Abstract: In the experiments， with the use of a single needle electrode， atmospheric pressure plasma jets are excited by a repetitive unipolar nanosecond-pulse generator， with working gases such as helium， argon， nitrogen and air. The results show that the jet length increases with the rise of applied voltage； as the flow rate of working gas increases， the length of jet becomes gradually longer and then reduces gradually to saturation after a certain flow rate due to turbulence. In addition， the plasma jets of different working gases have very different appearances. Helium and argon gas jets are needle-like， and the longest jet length is over 7 cm； whereas in nitrogen and in air， the jet is no more than 2 cm long， of brush-like mode.
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