G050022 高次精度LESによるSF6ガスアークプラズマ基礎特性に関する研究([G05002]流体工学部門一般セッション(2):複雑流)

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Circuit breaker is an apparatus that interrupts current and plays a role in control and protection of power system. As the need for electricity rises and high voltage power transmission, a large current interruption at the accident in addition to usual current opening and shutting is demanded for securing stability in the system. Due to the excellent insulation and current interruption properties of SF6 gas and the simplicity and high reliability of unit structure, auto-expansion type SF6 GCB (Gas Circuit Breaker) are generally used. Moreover it has the advantage in reducing operating energy. However its efficient design need a detail understanding of the fluid-plasma interaction phenomena associated with the gas blast characteristics. In the fluid-plasma interaction process, turbulence mixing between the high temperature arc plasma core and the surrounding fluid plays a dominant role. Therefore the main of this research is to study the fluid-plasma interaction phenomena based on a High-Order LES turbulence model. In this study, gas flow in a Laval nozzle in the presence of thermal arc in between the electrode placed in a nozzle is numerically simulated and followings are obtained. The heating of gas in the arc core region resulted in expansion of the gas, which in turn caused the occurrence of the movement of pressure wave-front towards upstream and downstream direction and the pressure near both the electrodes tip region increases. These phenomena led to emanating high velocity jet from the electrodes tip portion towards upstream and downstream directions in arc core region.
一般社団法人日本機械学会の論文
2011-09-11

G050022 高次精度LESによるSF6ガスアークプラズマ基礎特性に関する研究([G05002]流体工学部門一般セッション(2):複雑流)

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