摘要
为反映SF6断路器在短路开断过程中电弧与气流的作用,以磁流体力学理论为基础建立了SF6电弧二维物理数学模型,考虑了电场、磁场、湍动气流场及辐射场间的耦合作用及SF6气体物性参数随吹弧气流温度与压力变化对电弧等离子体的影响.采用有限体积法对SF6断路器短路大电流开断时的稳态电弧进行数值仿真,定量分析了SF6电弧与电磁及可压缩、有粘、有源、湍动气流间的相互作用.研究发现,电弧提高了灭弧室喷口上下游气流的压力差,并且电弧半径也因自身电磁力的作用而不断变化,在喷口喉部较大,而在电极附近较小.
A 2-Dimensional SF6 physical and mathematical arc model based on magnetohydrodynamics was derived for reflecting the interaction of arc and gas flow in the short circuit breaking process of SF6 circuit breaker. The interactions among the electric field, magnetic field, turbulent gas flow field and radiation field as well as the variety of SF6 physical parameters with gas flow temperature and pressure were considered. The behavior of arc in a SF6 circuit breaker during the short circuit breaking was simulated using finite volume method. Furthermore, the quantitative analysis on the interactions among the SF6 arC, electromagnetic field and compressible viscous active gas flow field was carded out. It is found that the arc improves the pressure difference between upstream and downstream. Moreover, the radius of arc column changes due to the effect of electromagnetic force. The radius is larger at the nozzle throat and is relatively smaller nearby the electrode.
出处
《沈阳工业大学学报》
EI
CAS
2009年第3期257-261,共5页
Journal of Shenyang University of Technology
基金
国家自然科学基金项目(50537010,50677039)
高等学校博士学科点专项科研基金项目(20060142001)
