大尺度大气压均匀介质阻挡放电等离子体射流的生成特性研究

Study on Generation Characteristics of Large-scale Atmospheric Pressure Homogeneous Dielectric Barrier Discharge Plasma Jet

搭建了一种能够生成大尺度大气压氮气均匀介质阻挡放电等离子体射流的电极结构实验装置。利用电场仿真软件和流体仿真软件研究了该电极结构的电场分布和流场分布;通过实验,分别对放电特性和射流特性进行研究。结果表明:采用厚度不均匀的阻挡介质,有利于在放电间隙中形成产生起始放电的亚毫米间隙,有利于沿电子崩的发展方向形成产生均匀放电的先大后小的电场分布,进而在大气压氮气或空气中实现较大区域的均匀介质阻挡放电。在实验中,利用气流的作用,在大气压氮气中实现了长10 mm、宽15 mm的大尺度等离子体射流。

This study reports the generation structure of experimental device of a large-scale atmospheric pressure homogeneous dielectric barrier discharge(HDBD)nitrogen plasma jet.The electric field distribution and flow field distribution of electrode structure is simulated by electric field simulation software and flow simulation software.And the discharge characteristic and plasma jet characteristic are studied and analyzed through experiments.The results show that by using dielectrics with non-uniform thickness,a sub-millimeter gap is formed in the discharge gap,which is conducive to the generation of initial discharge,and an electric field distribution from large to small is formed in the direction of the development of electron avalanche,which is conducive to the generation of uniform discharge,so as to achieve a large area of homogeneous dielectric barrier discharge in atmospheric pressure nitrogen or air.In the experiment,a large-scale plasma jet with a length of 10 mm and a width of 15 mm is formed in air under the action of nitrogen gas flow.