热空腔-喷气流的组合辐射

讨论了热空腔(喷气发动机的加力筒)和喷气流的组合辐射问题, 推演了组合辐射的辐射传输微分方程, 导出了有边界辐射条件下的解。讨论了由多个温度不同的壁面组成且腔内充满高温燃气的热空腔辐射传输方程解的具体形式, 导出了它向后半球的光谱辐射强度的表达式；同时还推导了热空腔-喷气流组合辐射的光谱辐射强度的表达式。最后给出算例, 算例结果表明, 热空腔-喷气流组合辐射的空间分布具有与实测分布较一致的梨形包络, 其光谱分布也与实测的光谱分布的一致性较好。 

THERMAL CAVITY-PLUME COMBINATION RADIATION

The problem of thermal cavity (afterburning cylinder of a jet engine) and plume combination radiation is considered.The radiative transfer differential equation was derived.The solution of the differential equation was then obtained under the radiative boundary conditions.The detailed solution of radiative transfer equation was elaborated for a thermal cavity,filled with high temperature gas and surrounded with multiple walls of different temperatures.The detailed spectral radiant intensity expression was also given for the back hemisphere.Then a spectral radiation intensity expression was also derived for the thermal cavity-plume combination radiation.Finally a numerical example was given.Its results show that the spatial distribution of the thermal cavity-plume combination radiation has a pear shape just like that of measurements.The spectral distribution is also consistent with measurements.