中文摘要：

为有效控制喷口区域气流运动,提高高压开关开断能力,以550kV单断口超高压SF6断路器为研究对象,提出不同喷口气流管道流动结构,采用有限体积法对灭弧室内冷气流流动进行数值模拟。通过对比分析断口区域不同压力观测点的压力分布,得到喷口上下游压力差的定量描述,以反映开断过程中喷口气流的流动行为。仿真结果表明,喷口长度和型面结构参数是控制气流流动的主要因素。

英文摘要：

In order to effectively control the gas flow movement and to improve the breaking performance of the extra high voltage switchgear,taking the 550 kV single-break SF6 circuit breaker as the study object,we proposed nozzle structures with different gas flow channel,and simulated the cold gas flow field in the arc quenching chamber using the finite volume method.Moreover,we obtained the pressure difference between the nozzle upstream and downstream by comparing the pressure distributions of the selected observation points in the breaking domain,to reflect the nozzle flow behavior during the breaking process.The numerical simulation results show that the length and the contour of the nozzle are the key parameters to control the gas flow behavior.