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产生超声速导电流体是开展磁流体(MHD)动力技术实验研究的前提,低温超声速条件下产生大体积均匀等离子体有效可行的方法之一是纳秒脉冲介质阻挡放电。介绍了基于马赫数为3吸气式双喉道风洞的超声速纳秒脉冲介质阻挡放电实验系统的基本组成、设计原理和运行情况,分别在静止和马赫数为3超声速条件下对气体电离,测量分析电压和电流波形。得到以下结论:风洞稳定工作时间约为16s,满足超声速气体放电实验的可靠进行和数据的有效采集;实验条件下,纳秒脉冲介质阻挡放电气体击穿与电场强度值有关,而与电场强度变化率无关;实验条件下,着火电压大小受超声速气流密度波动影响显著,而受气流速度影响较小。另外,气体击穿后的放电状态受超声速气流影响小;气体击穿时刻的电流峰值受着火电压和实验环境中随机自由电子数共同影响。
The generation of supersonic conductive fluid is a prerequisite for the experimental study of MHD dynamic technology. One of the most effective and feasible methods for generating large volume uniform plasma under low temperature and supersonic velocity is nanosecond pulse dielectric barrier discharge. The basic composition, design principle and operation of supersonic nanosecond pulsed dielectric barrier discharge test system based on Mach number 3 suction double throat tunnel were introduced. The gas ionization, Measurement and analysis of voltage and current waveforms. The conclusions are as follows: The stable working time of wind tunnel is about 16s, which can meet the reliable experiment of supersonic gas discharge and the effective data collection. Under the experimental conditions, the gas breakdown of nanosecond pulse dielectric barrier discharge is related to the electric field intensity, Under the experimental conditions, the size of the ignition voltage is significantly affected by the supersonic airflow density fluctuation, but less affected by the air velocity. In addition, the discharge state after the gas breakdown is affected by the supersonic airflow; the current peak at the time of the gas breakdown is affected by both the voltage of the fire and the number of random free electrons in the experimental environment.