SF_6高压断路器喷口中的湍流及其对介质恢复特性的影响

Turbulent Flow and Its Influence on Dielectric Recovery Property in Arc Nozzle of SF_6 High Voltage Circuit Breaker

在流体力学中,当流体遇到流路复杂的情况会产生湍流。断路器喷口的形状结构对吹弧气体中湍流的产生和发展具有最直接的影响。该文从宏观角度,选择不同的湍动模型,在改变喷口型面结构下,通过数值模拟,分析湍流的产生及湍流对SF6高压断路器吹弧气体流动及介质恢复特性的影响。光滑喷口壁面吹弧气体的流动表现为层流;凸凹不平的喷口壁面吹弧气体的流动表现为湍流;对存在有湍流的不同喷口,湍流发展得越充分,越有利于控制超音速流的发展,从而有利于提高介质强度恢复速度。

In fluid mechanics, the complex flow path will lead to a birth of turbulent flow. Therefore, the nozzle contour of circuit breaker affect directly the production and development of the turbulent flow in blowing gas flow. Various turbulent flow models and nozzle contours have been chosen in numerical simulation to analyze the influences on controlling effect on gas flow and dielectric strength recovery properties, which are caused by turbulent flow, from macro viewpoint. The results show that the gas flow is represented as laminar flow in fiat nozzle contour and turbulent flow in scraggling nozzle contour; The development of turbulent flow is good for the control effect of super-sound velocity gas flow and the dielectric strength recovery properties.