摘要
为了探求金属蒸气电弧弧前形成机理及宏观参数对微观弧前过程的的影响,基于漂移扩散方程组与泊松方程,对触头分断后的金属蒸气电弧弧前过程进行了数学建模与求解.仿真分析了触头间距离为4 mm,触头间电压为750 V,金属蒸气压强为66.66 Pa,温度为293.15 K条件下金属蒸气电弧的弧前过程.通过仿真结果得到金属蒸气电弧的动态弧前过程形成机理及宏观影响因素,很好地解释了金属蒸气电弧弧前过程中空间电荷时变规律及鞘层的形成机理,并从微观角度解释了开距及二次电子发射系数变化对弧前过程的影响.
In order to investigate the pre-arc formation mechanism of metal vapor arc and the influence of macroscopic parameters on the microscopic pre-arc process, the mathematical modeling and solution for the pre-arc process of metal vapor arc after the breaking moment of contacts were carried out based on both drift-diffusion equations and Possion equation. The pre-arc process of metal vapor arc under the condition that the distance between contacts was 4 mm, the voltage between contacts was 750 V, the pressure of metal vapor was 66. 66 Pa and the temperature was 293.15 K, was simulated and analyzed. With the simulated results, the formation mechanism of dynamic pre-arc process of metal vapor arc and its macroscopic influencing factors were obtained. And thus, the time-changing law of space charge and the formation mechanism of sheath in the pre-arc process of metal vapor arc can be well explained. In addition, the influence of both electrode separation and secondary electron emission coefficients on the pre-arc process gets explained from the microscopic angle.
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2013年第5期492-497,共6页
Journal of Shenyang University of Technology
基金
国家自然科学基金资助项目(50677039)
辽宁省特聘教授资助课题
关键词
电弧模型
弧前过程
电弧形成机理
微观仿真
金属蒸气电弧
飘移扩散方程
电极过程
粒子碰撞
arc model
pre-arc process
arc formation mechanism
microscopic simulation
metal vapor arc
drift-diffusion equation
electrode process
particle collision
