Study of the Compressible Nozzle Flow in a Gas Circuit Breaker

가스차단기의 소호노즐 내부에서 발생하는 압축성 유동에 관한 연구

Very frequently the compressible flow in an extinction nozzle of gas circuit breaker is simulated under no arc assumption, which can be reasonable for both high and low current breakings. In the present study, computations are performed to investigate the major features of the compressible flows inside the arc extinction nozzle of gas circuit breaker. A fully implicit finite volume scheme is applied to solve the two-dimensional, steady, compressible, Wavier-Stokes equations. The computed results are validated with the previous experimental data available. Several types of turbulence models are explored to reasonably predict the complicated flows inside the arc extinction nozzle. The obtained results show that the shock wave boundary layer interaction inside the nozzle significantly influences the whole performance of the gas breaker.