发展了二维梯度折射率介质热辐射传递求解的两种近似模型,线性折射率bar模型和混合bar模型。对于辐射能传递路径的求解,涉及到四个坐标系的转换:系统坐标系、网格坐标系、网格旋转坐标系和散射的当地坐标系。同时假设辐射能在每个网格内是在平面内传递。通过这两个模型的建立和新的假设条件,对于二维梯度折射率介质的热辐射传递求解的一系列问题均可较为容易地求解。
Two approximate models are presented for the solution of radiative transfer in two- dimensional graded index medium, the linear refractive index bar model and the mixed bar model. Four coordinate systems are involved in the calculation, named as global coordinate system, mesh coordinate system, mesh rotating coordinate system and local coordinate system. We suppose that the radiative bundle have a two-dimensional trajectory in every mesh. Based on the hypothesis and the two models, solutions of the radiative transfer in a two-dimensional graded index medium can be obtained more easily.