Prediction of radiative heating of internal surfaces of hydrogen and air laser plasma generators intended for aerospace applications

Time-accurate simulation of gas dynamic structures resulting at viscous, heat conducting and radiating gas flows through localized laser plasma in Laser Supported Plasma Generator (LSPG) is performed. Developed numerical simulation model is based on the Navier-Stokes equations, energy conservation equation for chemically equilibrium heat conducting gas, and on the radiation heat transfer equation in multi-group spectral approximation. Air and hydrogen of atmospheric pressure are investigated as plasma-forming gas. Radiative heating of internal surface of the air and hydrogen LSPG is studied numerically. Group and integral radiation heat fluxes on internal surface of the LSPG cylindrical channel were calculated by the P₁-approximation of the Spherical Harmonics method, the Discrete Directions method, and the Discrete Ordinales method. Numerical simulation results are compared.