Numerical simulation and experimental verification of plasma jet development in gas gap switch

作     者：董冰冰 郭志远 张泽霖 文韬 向念文 Bingbing DONG;Zhiyuan GUO;Zelin ZHANG;Tao WEN;Nianwen XIANG

作者机构：Hefei University of TechnologyHefei 230009People’s Republic of China 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2023年第25卷第5期

页      面：159-169页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 07[理学] 08[工学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：supported by National Natural Science Foundation of China(No.52107142) 

主　　题：gas gap switch plasma jet k-εturbulence model numerical calculation experimental verification 

摘      要：Plasma jet triggered gas gap switch has obvious advantages in fast control *** development of the plasma in the ambient medium is the key factor affecting the triggering conduction of the gas ***,the plasma jet process and its characteristic parameters are complicated and the existing test methods cannot fully characterize its development *** this work,a two-dimensional transient fluid calculation model of the plasma jet process of the gas gap switch is established based on the renormalization-group k-εturbulence *** results show that the characteristic parameters and morphological evolution of the plasma jet are basically consistent with the experimental results,which verifies the accuracy of the simulation model *** plasma jet is a long strip with an initial velocity of 1.0 km·s-1and develops in both axial and radial *** jet velocity fluctuates significantly with axial *** the plasma jet enters the main gap,the pressure inside the trigger cavity drops by80%,resulting in a rapid drop in the jet *** the plasma jet head interacts with the atmosphere,the two-phase fluid compresses each other,generating a forward-propelled pressure *** plasma jet heads flow at high velocity,a negative pressure zone is formed in the middle part of the jet,and the pressure peak decreases gradually with *** the value of the inlet pressure increases,the characteristic parameters of the plasma jet *** entrainment phenomenon is evident,which leads to an increase in the pressure imbalance of the atmospheric gas medium,leading to a significant Coanda *** with air,the characteristic parameters of a plasma jet in SF6are lower,and the morphological evolution is significantly *** results of this study can provide some insight into the mechanism of action of the switch jet plasma development process.