平截头圆锥体划分为三个辐射面—火焰侧面、火焰顶面及火焰底面。基于微元思想进一步对喷射火辐射表面进行了合理的离散化，对喷射火平截头圆锥体的视角因子进行研究。

-To simplify the view factor calculation process, the cone frustum with a certain angle is transformed into the vertical cone frustum and the transform parameter formulas are achieved.