含各向异性散射粒子的平板状半透明介质层发射特性

用蒙特卡罗（Monte－Carlo）法研究了含粒子平板状半透明等温介质层的发射特性．在辐射能传递的模拟计算中，考虑了半透明表面的折射和镜反射作用及稀相粒子系的各向异性散射效应．给出了介质层温度、介质折射率和粒子直径不同时的介质层半球发射率和方向发射率分布，并通过分析粒子直径和介质折射率对粒子系衰减系数及反照率的影响解释了介质层半球和方向发射率随粒子直径和介质折射率的变化规律．

Emitting Characteristics of a Semitransparent Medium Layer with Anisotropic Scattering Particles

The emitting characteristics of an isothermal semitransparent medium layer with particles is investigatedby the Monte Carlo method. The refraction and specular reflection of the semitransparent surfaces as well as theanisotropic scattering of the particles are considered in the radiation transfer simulation. The hemispherical emissivities and the directional emissivity distributions are presented for various cases with different medium layer temperatures, medium refiactive indexs and different particle sizes. The vallations of the directional and hemisphericalemissivities with the particle size and the medium refractive index are explained by analyzing the influences of particle size and medium infractive index on the exinction cocfficient and Ihe albedo of the particles.