A new method

based on the concept that the turbulence and heat transfer of plasma are suppressed under the magnetic field

was proposed to separate the high temperature gas from nozzle wall by controlling the cold plasma with magnetic field.The purpose of this method is to reduce heat transfer from high-temperature gas to nozzle wall

thereby cutting down the wall temperature.The equation of induced magnetic field was set up to calculate the Lorentz force

and the modified k-ε turbulence model under magnetic force was used to measure the viscosity of turbulence.Numerical simulation was conducted to determine the flow and heat transfer characteristics of magnetic plasma under different magnetic fields.The results show that

the magnetic field could efficiently suppress the turbulence strength and reduce the heat transfer capability for lower nozzle wall temperature;the stronger the magnetic field

the more distinct the effects are.