Efficient design of thermal puffer type gas circuit breaker need a detail understanding of the fluid-plasma interaction phenomena associated with the gas blast characteristics. Therefore the main aim of this research is to study the fluid-plasma interaction phenomena based on a High-Order LES turbulence 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.
