中文摘要：

基于传统热流法，提出一种圆柱坐标系下的源项六流模型（Source Six Flux，SSF），可快速准确地计算参与性介质内任意方向的出射辐射强度．详细介绍SSF模型的基本原理和求解步骤，以圆柱形吸收、散射、发射性介质为例，模拟其沿任意方向的出射辐射强度，并与反向蒙特卡罗法（Backward Monte Carlo，BMC）和二流法（Two Flux Method，TFM）的计算结果进行比较．结果表明，SSF法与BMC法的计算结果吻合较好，计算精度均高于TFM法，但SSF法的计算效率明显优于BMC法．因此，SSF模型是一种适用于计算任意方向辐射强度问题的高效数值模型．

英文摘要：

Based on traditional flux method, a source six flux （SSF） model in cylindrical coordinate is proposed for arbitrary directional radiative intensity. Basic theory and numerical procedure of SSF model are presented in detail. Compared with directional radiative intensity by two flux method （TFM） and Backward Monte Carlo （BMC） method in cylindrical media, results of SSF method agree well with those of BMC. However, SSF method is more efficient than BMC, thus SSF method is more suitable in solving directional radiative intensity problems.