In order to research the effects of afterburning on infrared radiation characteristics of liquid rocket exhaust plume,a simulation model was founded which was able to calculate afterburning plume field and infrared radiation characteristics of exhaust plume. Firstly,liquid rocket plume field was simulated by FLUENT,in which the afterburning reaction was controlled by finite rate chemistry reaction. Secondly,line by line integral method(LBL)was used to calculate the parameters of plume gas,based on HITEMP da...