辐射换热的分区计算研究

本文利用蒙特卡洛法模拟圆柱形参与性介质内的辐射换热过程,分区计算了温度仅沿轴向(一维)变化和同时沿轴向和径向(二维)变化的吸收、发射、各向异性散射介质的边界热流分布,将各子区域的边界面假想为等效黑体面,采用由子区间的投射热流计算假想等效黑体面温度的方法,通过分别对介质温度分布一维和二维两种变化情况的研究表明,分区方法可以大大节省计算机内存,同时子区间介质的温度水平,几何尺寸比例以及各区间重合的光学厚度是影响热流分布精度的主要因素。

STUDY ON THE RADIATIVE HEAT TRANSFER BY PARTITION ALLOCATION METHOD

In this paper, the radiative heat transfer in participating cylindrical medium is approximated by the Monte-Carlo method, in which the boundary flux distribution is calculated by the partition allocation method. Two temperature distribution of the absorbing-emitting-anisotropically scattering medium is selected: temperature varying along the axis direction (1 dimensional); temperature varying along the axis and radius direction simultaneously (2 dimensional). In the partition method, every sub-domain is isolated by imaginary equivalent black wall resulted from the incident radiative flux on the imaginary interface and overlaps each other. By the study on the 1D and 2D temperature distribution medium, the results indicate that the present partitioned treatment can save memory efficiently. The results also show that the temperature level in every domain, the overlap optical thickness and the aspect ratio may be three main parameters to influence the accuracy of partition allocation method.