初始种子电子对SF_6间隙放电行为的影响  

Influence of seed electron on dynamic behaviors of discharge process in SF_6 short gap

作　　者：赵大伟[1] 王佳[1] 郑殿春[1] 丁宁[1] 陈春天[1] 杨仁旭[1] 

机构地区：[1]哈尔滨理工大学工程电介质及应用技术教育部重点实验室,黑龙江哈尔滨150080

出　　处：《电机与控制学报》2015年第8期115-120,共6页Electric Machines and Control

基　　金：国家自然科学基金资助项目(51077032)

摘　　要：基于流体理论和气体放电特性,数值模拟了大气压下充满SF6气体的板电极8 mm间隙的放电过程,在建立二维光致电离-流体动力学放电模型基础上综合考虑了SF6气体的理化性能。根据气体放电现象的物理本质及模拟结果,从微观机理上开展对放电电子、电场以及电子漂移速度在放电过程中时空分布的研究,获得了以上物理量随初始放电因素变化的时空特性。结果表明:初始种子电子团密度峰值N0与空间电子、电场强度分布以及电子漂移速度分布的变化梯度密切相关;初始种子电子团分布位置z0虽然也对以上微观参量造成一定影响,但主要作用体现在改变流注发展过程的时空尺度上。The discharge process of SF6 in 8 mm parallel-plate system at atmospheric pressure was simula-ted within the framework of the two-dimensional photoionization-hydrodynamic model, based on the theory of the hydrodynamic mechanics and gas discharge characteristics. Besides, the chemical and physical properties for SF6 were taken into account in the proposed model. Then the evolutions of the charged par-ticles were investigated in detail, the distributions of the gap-space electric field as well as electron drift velocity were revealed from the microscopic mechanism. The tempo-spatial critical point of the avalanche-to-streamer in this model was also discovered, according to the physical nature of the gas discharge phe-nomenon and simulation results. Furthermore, the tempo-spatial characteristics of above microscopic physical quantity were obtained, which vary with the initial discharge factors. Meanwhile, the random lo-cation for the initial seed electron has some impact on the above microscopic parameters, whereas mainly on the tempo-spatial scales of the streamer development process.

关 键 词：流体模型 短间隙 SF6 放电 恒定电场 

分 类 号：O461[理学—电子物理学]