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脉冲电压上升沿对He APPJ管内放电发展演化特性的影响研究

朱彦熔 常正实

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脉冲电压上升沿对He APPJ管内放电发展演化特性的影响研究

朱彦熔, 常正实

Effects of Pulse Voltage Rising Edge on the Discharge Evolution of He APPJ in Dielectric Tube

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  • 本文通过仿真和实验相结合的手段,以直流脉冲电压驱动的双环电极结构He APPJ为例,研究了电压上升沿时间对管内放电等离子体发展演化特性的影响。随着电压上升沿的改变,管内DBD区出现空心和实心两种放电模式。上升沿为纳秒和亚微秒量级时,以空心模式发展,上升沿持续增加后转变为实心模式。放电模式本质上受鞘层厚度、管内电场和表面电荷密度分布的影响,鞘层厚度小于1.8mm时等离子体通常以空心模式传播,等于1.8mm时等离子体的径向传播范围有限而转变实心传播。管内DBD区,电场以轴向分量为主时,等离子体以放电起始时的模式传播;而在地电极内部,由于外施电场方向发生径向偏转,同时管壁沉积的正电荷形成径向自建电场,两者叠加形成的强径向电场致使放电以空心模式传播。
    In this work, we employing pulse voltage to driving atmospheric pressure plasma jet (APPJ) in Helium, and mainly consider the evolution of discharge inside tube. Specifically, the effects of rising edge on the discharge evolution were studied by combing the simulation and experiment. The temporal and spatial evolution of electron density, ionization source, electron temperature and excited helium atom were evaluated. Besides, the effect mechanism of rise time was analyzed by the parameters such as discharge current, sheath thickness and surface charge density distribution. In considered cases, the ionization wave propagates to the ground electrode and downstream of the active electrode in the dielectric tube. Plasma with faster rising edge has larger electron temperature, discharge current, electron density and electric field strength. With the change of voltage rising edge, there are two discharge modes: hollow mode and solid mode in DBD area. When the rising edge is nanosecond and sub microsecond, it develops in hollow mode, and changes to solid mode after the rising edge continues to increase. Both discharge modes are essentially affected by the sheath thickness, the electric field distribution and the surface charge density inside the tube. When the sheath thickness is less than 1.8mm, the plasma usually propagates in hollow mode, and when the sheath thickness is equal to 1.8mm, the radial propagation range of the plasma is limited and changes to solid propagation. In the DBD region, when the electric field is mainly axial component, the plasma propagates in the mode at the beginning of discharge; Inside the ground electrode, due to the radial deflection in the direction of the applied electric field, and the positive charge deposited on the tube wall forms a radial self built electric field, the strong radial electric field formed by the superposition of the two causes the discharge to propagate in a hollow mode.
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  • 被引次数: 0
出版历程
  • 收稿日期:  2021-03-11
  • 上网日期:  2021-10-12

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