Fluid model for a partially packed dielectric barrier discharge plasma reactor
Fluid model for a partially packed dielectric barrier discharge plasma reactor
复制标题
DOI：
10.1063/1.5000523
复制
发表时间：
2017-09-01
影响因子：
2.2
通讯作者：
Gu, Sai
中科院分区：
文献类型：
--
作者：
Gadkari, Siddharth;Tu, Xin;Gu, Sai
建立了纯氦部分填充介质阻挡放电(DBD)的二维数值流体模型。通过比较部分填充DBD和无填充DBD的放电特性，研究了填充对放电特性的影响。在本文所研究的轴向部分堆积结构中，在球形堆积材料的顶面以及堆积与介质层之间的接触点，电场强度都得到了增强。对于每一个施加电位值，与没有填充的DBD相比，有部分填充的DBD在施加电压的正半周期内的电流分布中的脉冲数目增加。在单独的等离子体DBD中添加部分填充也导致击穿时刻的电子和离子数密度的增加。时间平均电子能量分布表明，在相同的施加功率下，使用部分堆积的电子能量范围比在DBD中不堆积的电子能量范围大得多。在一个电压周期内的空间和时间平均值也显示出在DBD中包含部分堆积时功率密度和电子能量的增加。对于本文研究的外加电压参数，发现放电始终是均匀的，并表现出大气压辉光放电的特征。(C)2017年作者(S)。
In this work, a two-dimensional numerical fluid model is developed for a partially packed dielectric barrier discharge (DBD) in pure helium. Influence of packing on the discharge characteristics is studied by comparing the results of DBD with partial packing with those obtained for DBD with no packing. In the axial partial packing configuration studied in this work, the electric field strength was shown to be enhanced at the top surface of the spherical packing material and at the contact points between the packing and the dielectric layer. For each value of applied potential, DBD with partial packing showed an increase in the number of pulses in the current profile in the positive half cycle of the applied voltage, as compared to DBD with no packing. Addition of partial packing to the plasma-alone DBD also led to an increase in the electron and ion number densities at the moment of breakdown. The time averaged electron energy profiles showed that a much higher range of electron energy can be achieved with the use of partial packing as compared to no packing in a DBD, at the same applied power. The spatially and time averaged values over one voltage cycle also showed an increase in power density and electron energy on inclusion of partial packing in the DBD. For the applied voltage parameters studied in this work, the discharge was found to be consistently homogeneous and showed the characteristics of atmospheric pressure glow discharge. (C) 2017 Author(s).