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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Investigation of capillary nanosecond discharges in air at moderate pressure: comparison of experiments and 2D numerical modelling
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Investigation of capillary nanosecond discharges in air at moderate pressure: comparison of experiments and 2D numerical modelling

机译：中压空气中毛细管纳秒放电的研究：实验与二维数值模拟的比较

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摘要

Nanosecond electrical discharges in the form of ionization waves are of interest for rapidly ionizing and exciting complex gas mixtures to initiate chemical reactions. Operating with a small discharge tube diameter can significantly increase the specific energy deposition and so enable optimization of the initiation process. Analysis of the uniformity of energy release in small diameter capillary tubes will aid in this optimization. In this paper, results for the experimentally derived characteristics of nanosecond capillary discharges in air at moderate pressure are presented and compared with results from a two-dimensional model. The quartz capillary tube, having inner and outer diameters of 1.5 and 3.4 mm, is about 80mm long and filled with synthetic dry air at 27 mbar. The capillary tube with two electrodes at the ends is inserted into a break of the central wire of a long coaxial cable. A metal screen around the tube is connected to the cable ground shield. The discharge is driven by a 19 kV 35 ns voltage pulse applied to the powered electrode. The experimental measurements are conducted primarily by using a calibrated capacitive probe and back current shunts. The numerical modelling focuses on the fast ionization wave (FIW) and the plasma properties in the immediate afterglow after the conductive plasma channel has been established between the two electrodes. The FIW produces a highly focused region of electric field on the tube axis that sustains the ionization wave that eventually bridges the electrode gap. Results from the model predict FIW propagation speed and current rise time that agree with the experiment.
机译：电离波形式的纳秒放电对于快速电离和激发复杂的气体混合物以引发化学反应非常重要。以较小的放电管直径进行操作可以显着增加比能沉积，因此可以优化引发过程。分析小直径毛细管中能量释放的均匀性将有助于此优化。在本文中，给出了在中等压力下空气中纳秒毛细管放电的实验导出特性的结果，并将其与二维模型的结果进行了比较。石英毛细管的内径和外径分别为1.5和3.4毫米，长约80毫米，并在27毫巴下充满合成干燥空气。两端带有两个电极的毛细管插入一根长同轴电缆的中心线的断点中。管周围的金属屏蔽层已连接到电缆接地屏蔽层。放电由施加到通电电极的19 kV 35 ns电压脉冲驱动。主要通过使用校准的电容式探头和反向电流分流器进行实验测量。数值建模的重点是在两个电极之间建立了导电等离子体通道后的快速余辉中的快速电离波（FIW）和等离子体特性。 FIW在管轴上产生高度集中的电场区域，该区域维持电离波，最终弥合电极间隙。该模型的结果预测FIW传播速度和电流上升时间与实验相符。

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