The infrared signal in 3~5μm band of an axisymmetric nozzle was calculated to investigate the improvement of the temperature corrected k-ε turbulence model in the infrared radiation(IR) of exhaust system

and compared with the experimental results.The flow fields and temperature fields of nozzle were simulated numerically by using finite volume method(FVM) and solving Navier-Stokes(N-S) equations

and coupled with the standard k-ε model and the temperature corrected k-ε model respectively.The IR signal was calculated by FVM in non-gray absorbing-emitting media to slove the 3-D radiative transfer equation

and the atmosphere attenuation effect on IR was considered.The results show that the temperature corrected k-ε model can predict the potential core length of hot jet

and consequently the IR intensity agrees with the experiment data.The maximum value of relative error for IR intensity obtained using the temperature corrected k-ε model is 4.3%

while that obtained using the standard k-ε model is up to 64%.This shows that the temperature corrected k-ε model is appropriate for accurate simulation of IR characteristics of exhaust system.