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提出一种火花放电等离子体射流发生器,可获得能量较高的零质量射流。其工作频率可达9k Hz,可在大气压下产生持续的平均速度较高的射流。详细阐述了该射流发生器结构;通过对其放电形态的研究,探讨了产生射流的机理;利用皮托管测量了射流平均速度,研究了发生器电极间距及外加电参数对射流平均速度的影响,测量了射流平均速度轴向分布;得到了该等离子体射流发生器的射流特性曲线。实验结果表明,该发生器产生的持续射流平均速度可达40m/s以上;增大加载电压还可提高射流速度;对给定的射流发生器,存在最佳电极间距和电压频率。
A spark discharge plasma jet generator is proposed to obtain zero energy jet with high energy. The operating frequency of up to 9k Hz, at atmospheric pressure can produce sustained high average jet speed. The structure of the jet generator is described in detail. The mechanism of jet generation is discussed through the study of its discharge morphology. The jet velocity is measured by pitot tube. The influence of generator electrode spacing and applied electric parameters on jet average velocity is studied. The axial distribution of the average velocity of the jet was measured. The jet characteristic curve of the plasma jet generator was obtained. The experimental results show that the average continuous jet velocity of the generator can reach over 40m / s. Increasing the loading voltage can also increase the jet velocity. For a given jet generator, there is the optimal electrode spacing and voltage frequency.