Modelling and simulation of lateral jet infrared radiation based on the light of sight method

In order to study the effect of flight altitude on the radiation characteristics of engine lateral jet, based on the simulation results of three-dimensional flow field, radiation transfer equation and molecular spectral line parameter database, we applied the apparent light line of sight method to solve the lateral jet radiation transfer equation and established a procedure to calculate the infrared radiation characteristics of the lateral jet of the attitude control engine; Correct the spectral line intensity of gases at high temperature and pressure. Using the spectral band model to calculate the spectrum absorption coefficients. The infrared radiation characteristics of the lateral jet of the attitude control engine at different flight altitudes are studied, and the distribution of the infrared radiation brightness of the lateral jet in different bands is obtained. The lateral jet spectral irradiance of the attitude control engine decreases with the increase of flight altitude in the low altitude environment, and increases with the increase of flight altitude in the high altitude environment. The results show that the program can simulate the infrared radiation characteristics of the lateral jet of the attitude control engine well and is widely applicable; Different flight altitudes affect the infrared radiation characteristics of the lateral jet of the engine to a certain extent and the flight altitudes at low and high altitudes have different effects on the radiation characteristics of the lateral jet of the attitude control engine.