贴体坐标系下离散坐标法计算尾喷焰辐射特性

在计算尾喷焰燃气组分、辐射物性的基础上，用贴体坐标系下的离散坐标法(DOM)，研究了不同工况下尾喷焰的红外光谱辐射特性随飞行高度的变化特征，分析了介质的辐射物性对尾喷焰辐射特性的影响．研究结果表明：尾喷焰的辐射物性对尾喷焰辐射传输计算有很大的影响；在所考虑的工况下，与喷焰轴向全立的方向上光谱辐射最强。

Numerical modeling of infrared radiation properties of exhaust plume by the Discrete Ordinates Method in body-fitted coordinates

The parameters of concentration and temperature distribution of particles and radiative parameters of gas phase molecular species are computed. The Discrete Ordinates Method in general body-fitted coordinates is used in investigating the relation between the radiation field of exhaust plume and flight altitude and Mach number, and the influence of media radiative properties on plume radiation is also analyzed. The results show that the media radiative properties intensively affect the exhaust plume radiation, for example, the particles scattering can smooth the radiative field in exhaust plume. Under the conditions described in the paper, the spectral radiative intensity vertical to axis is maximal.