Multi-component jet flow field and radiation analysis based on DSMC method

The direct Simulation Monte Carlo (DSMC ) method is used to calculate the flow field of the five-component (N₂/H₂/CO/NO/CO₂) gas , and the macro parameter parameters of the virtual molecules are transformed according to the micro-macro corresponding transformation relationship According to the simulation results, it is found that the flame diffusion effect in vacuum is obvious. Among the five components, the expansion range of H₂ molecules with lighter molecular weight is smaller. Analyzing the number density distribution of gas molecules on the axis of the jet nozzle, The five number densities are in the order of 10¹⁸ -10¹⁹/m³ .The line-by-line method is used to calculate the radiation of the flow field . It is found that due to the existence of CO₂ and CO, there is greater radiation intensity near the range of 4.0-5.0μm .