Radiation characteristics simulation of non-equilibrium flow field around the hypersonic blunted cone

In this paper, the thermo-chemical non-equilibrium flow filed of RAM-CII blunted cone was simulated with CFD-FASTRAN, then the absorption and emissive coefficients of the non-equilibrium flow filed were gotten by the multi-temperature mode and line-by-line method. At last, the LOS method was used to simulate the radiation characteristics of the flow field around the blunted cone. The results showed that the strongest UV radiation (0.2~0.4 μm) intensity of the shock layer is at the nose of the blunted cone, which is three orders stronger than that of the wake, and the radiation in the side direction is nearly one order bigger than that in the head-direction. The total radiative intensity of the flow field at different heights is not far-off in the same direction, and the radiative intensity in the side direction is a little lager than that in the head-direction. The IR radiation (2~5 μm) of the flow field focus on the 2.7 μm and 4.3 μm band of the CO₂ molecular, and in the whole the IR radiative intensity is three orders smaller than UV radiation.