高温多组分混合气体热导率理论预测

Accurately obtaining the thermal properties of high-temperature gas is the basis for numerical simulation of rocket engine nozzles. Since it is extremely difficult to obtain the thermal conductivity of gas at high temperature by experimental methods, it is a better choice to predict the thermal conductivity of gas at high temperature based on theoretical calculation methods. In this study, the thermal conductivities of H₂, CO, and N₂ gases in the temperature range of 300 K to 4000 K were calculated using the Istomin correction considering high-temperature electronic excited states. Combined with the Wassiljewa equation, a theoretical prediction model for the thermal conductivity of multi-component gas mixtures at high temperatures was constructed, and the thermal conductivity of the gas mixtures of the two combustion gases in the temperature range of 300K to 4000K was predicted, providing gas reference thermal property data for the refined simulation of the rocket engine nozzle.