Abstract: A mechanism model for arc discharge plasma is analyzed.An exploding wires diathermanous model for of arc discharge plasma incident shock was found.It shows that thermal mechanism dominating the shock wave control process is arc discharge plasma aerodynamic actuation.Effect of arc discharge plasma to supersonic flow field is a conform of protuberance with a bevel.The theoretical analysis is suit only for small y.The exploding wires diathermanous model is good for arc discharge plasma incident shock as diathermanous power rate is 10% of discharge power.The plasma wedge angle and incident shock angle decrease as total pressure and flow velocity increased,and they increase as average power of discharge increased.These variations are obvious at low total pressures,low flow velocities and low average powers.

Key words: arc discharge, plasma aerodynamic actuation, incident shock, exploding wires diathermanous model, numerical computation