Abstract: The propellant gas is ionized to form thermal plasma at high temperature, which has good conductivity. For the problem of thermal ablation of weapon barrel by high temperature propellant gas, a method to reduce the surface temperature of barrel bore by using magnetron plasma is presented. A turbulent dissipation model of high temperature conductive gas in cylinder structure is constructed by using the magnetic fluid description method. The influences of different magnetic field directions on the viscosity effect of conductive gas and the wall temperature of cavity are studied. The effect of coaxial magnetic field on the heat transfer characteristics of conductive gas is tested by infrared thermal imaging technology. The results show that magnetic field which is perpendicular to the direction of flow can effectively reduce the turbulent kinetic energy and turbulent viscosity of conductive gas and weaken its heat transfer capability, the flow distribution has the anisotropy characteristics, and the turbulent kinetic energy and turbulent viscosity along the magnetic field direction are lower than those in the direction perpendicular to the magne-tic field. The coaxial magnetic field can limit the radial diffusion of charged particles and reduce the heat transfer of conductive gas to the wall of cylinder, thereby reducing the wall temperature. Key

Key words: weapontube, explosivegas, magneticfielddirection, conductivegas, turbulentkineticenergy, magneticfluid, heattransfercharacteristic