Simulation of gas temperature decay in spark gap switch

Gas temperature decay is the primary factor which restricts the repetitive operation of spark switch. The gas temperature decay in gas spark switch after operation is simulated based on fluent equation, thermal conductivity equation and general gas law. The simulated results indicate some rules of the gas temperature decay in spark gap switch:(1) the heat loss of the gas is mainly caused by thermal conduction;(2) the hot gas an hardly cooldown in several tens of milliseconds;(3) the influence of convection are notable after a few tens of milliseconds; (4) the influence of the viscosity coefficient of gas on the temperature decay could be ignored. Finally the methods for accelerating gas decay are discussed and presented.