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中文摘要：
为了研究大气压刷形等离子体羽的放电特性，利用针-针直流放电系统，通过氩气的流动，在大气压空气中获得了稳定的较大体积的刷形等离子体羽，发现等离子体羽长度随电源输出功率的增大而增大。通过研究不同电源输出功率下放电电压、放电电流和发光信号相对光强的时间演化，发现了放电存在自脉冲现象，且自脉冲频率随电源输出功率增大而减小，随气体体积流量增大而增大。通过对等离子体羽发光信号进行空间分辨测量，研究了自脉冲形成机制，发现电压达到击穿电压后放电首先在电极间产生，随后电极间的等离子体沿着气流移动，且随移动距离增加而衰减，因此刷形等离子体羽即为吹出喷嘴后衰减中的等离子体。采用光谱学方法，对分子转动温度、振动温度和谱线相对光强比（I391/I337．1）进行了空间分辨测量，发现这些参数均沿气流方向降低。
英文摘要：
In order to obtain the discharge characteristics of bush-shaped plasma plume under atmospheric pressure, we generated this plasma stably in a DC excited discharge device and found that the length of plasma plume increases with the output power of DC source. After investigating the temporal evolution of discharge current, light emission, and plas- ma-sustaining voltage for different output power, we concluded that the plasma discharge is self-pulsing with a frequency increases with increasing output power and decreasing gas flow rate. We also performed spatially resolved measurements on the light emission signals to understand the self-pushing mechanism. When the applied voltage reaches the breakdown value, breakdown initiates firstly in the intra-electrode region, where plasma is generated, then blown out along with flowing argon, and eventually decays with distance from the nozzle. Consequently, this decaying plasma is observed as plasma plume. Through optical emission spectroscopy, we investigated the rotational temperature, vibrational temperature and spectrum relative intensity ratio （I391.4/I337.1） different locations, and found that all of these parameters decrease along the direction of gas flow.
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同项目期刊论文
Spatial-temporal patterns in a dielectric barrier discharge under narrow boundary conditions in argo
Investigation on the micro-discharge characteristics of dielectric barrier discharge in a needle-pla
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