高次精度LESによるSF6ガスアークプラズマ特性とパッファ形ガス遮断器における吹付圧力上昇のメカニズムに関する研究

概要

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Thermal puffer type SF6 Gas Circuit Breaker (GCB) has the advantage in reducing operating energy. However, its efficient design needs 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 aim of this paper is to study the fluid-plasma interaction phenomena based on three dimensional compressible turbulent viscous flow analyses using a High-Order LES turbulence model along with arc plasma model. The first part of this work deals with basic fluid-plasma interaction phenomena around a converging-diverging type nozzle installed with two electrodes inside to generate thermal arc plasma in the nozzle flow field. In the second part of this work, pressure rise mechanism in a thermal puffer type GCB and related physical behavior is analyzed. The results led to an understanding, that basically fluid-plasma interaction results in sudden expansion of the hot gas which in turn led to the pressure rise in the tank and the transport of thermal and pressure energy is carried out through two different modes, namely the convection and the acoustic mode.