高压SF6断路器电弧与气流相互作用研究

以二维N—S方程和湍流模型为基础，在考虑了灭弧室内吹弧气流温度、压力等物理因素影响后，建立了高压SF6断路器电场／气流场数值求解模型，反映了气吹对电弧形态的影响及电弧电流的自适应调整。并以500kV单断口SF6断路器短路开断为例，进行了电场及跨音速、可压、复杂流路、变边界条件的气流场求解研究，并对燃弧区域电弧堵塞、动态电弧与吹弧气流的相互作用、气流压力、速度变化以及电弧堵塞前后喷口区域质量流与气流压力定量变化进行了数值仿真分析，为进一步定量研究电弧能量有效利用及更有成效进行高压断路器开断过程仿真研究奠定基础。

STUDY ON ARC-FLOW INTERACTION FOR A HIGH VOLTAGE SF6 CIRCUIT BREAKER

The combined electric field and flow field has been simulated based on the computation of the N-S equation and turbulent model, with the influence of temperature, pressure and the effect of gas flow on the arc and self-adaptive adjustment of the current considered, for reflecting the dynamic variation mechanism of the arc during the whole interrupting course. And the gas flow field of 1-break 500kV SF6 circuit breaker with complex flow path, supersonic nozzle, active, viscous, compressible and variable boundaries has been solved. Moreover, in the interrupting course of the circuit breaker, the interaction of dynamic variation of the arc and gas flow has been simulated. The simulation results present qualitatively the feature of arc-flow interaction,show the presence of a localized form of arc choking of the gas flow,obtain the variation of the pressure of gas flow and velocity, and illustrate the relation between the mass flow and pressure around the arcing region. The theoretical basis for further studying the utilization of arc energy and improving interrupting performance has been provided.