Numerical study of the interaction of high-velocity flow generated by the quasi-stationary plasma accelerator with magnetic field created by the set of ring conductors with a current is presented. Simulation was carried out on the basis of the set of the MHD equations taking into account the electrical conductivity, thermal conductivity, and radiation transport. Possibility of a step-by-step increase in plasma temperature is revealed as a result of flow deceleration in magnetic field of several coils with a current.