发射特性对线性各向异性散射介质内瞬态温度分布的影响(英文)

Effect of emitting characteristics on transient temperature distribution in linearly anisotropic scattering media

考虑各向异性散射介质内的辐射传递方向 ,本文考察了辐射能的重新分配过程。利用射线踪迹法结合Hottel和 Sarofim区域法推导了辐射传递系数 (RTCs)。考虑一维各向异性参与性半透明灰介质。两边界表面为镜反射 ,一个表面半透明 ,另一个表面不透明。辐射传递系数用于计算辐射热源项。瞬态能量方程由全隐式控制容积法求解。外界辐射加热与对流冷却同时作用于边界表面。考虑四个线性散射相函数。以各向同性散射情况比较 ,研究不透明边界两侧发射特性和线性散射相函数对瞬态温度分布的影响。结果表明 ,各向异性散射与各向同性散射介质间的相对温度差异与散射不对称参数近似成正比。

Considering radiation transfer direction, this paper investigated redistribution of radiant energy in the case of anisotropic scattering and deduced radiative transfer coefficients (RTCs) by ray tracing method combined with Hottel and Sarofim's zonal method. One-dimensional anisotropically participating translucent gray media was considered. Boundary surfaces were of mirror reflection and one of surfaces was with coating. RTCs were used to calculate radiative heat source term. Transient energy equation was solved by fully implicit control-volume method. Boundary surfaces were simultaneously exposed to both radiative heating and convective cooling. Four scattering phase functions were taken into account. Taking isotropic scattering as a reference, effects of emitting characteristics for both sides of opaque surface and linearly anisotropic scattering phase functions on transient temperature distribution were analyzed by calculation. The results show that relative temperature differences between the linearly anisotropic scattering and isotropic scattering media are approximately proportional to the scattering asymmetry parameter.