A numerical study is conducted to investigate the effects of thermal radiation on flame spread phenomenon close to limiting oxygen conditions in a low convective spacecraft environment. To understand the role of radiative heat loss from the flame, a set of simulations is performed where gas radiation is completely suppressed. The results show that radiation exerts a dual influence on flame spread rate depending on oxygen concentration. If there is more radiative heat loss from the flame, the limiting oxygen concentration increases, and the size of the flamelet decreases. It was observed that in the absence of gas radiation, oscillating near-limit flamelets stabilise and merge into a single flame. Further, the effects of surface radiation were studied by varying emissivity of the solid fuel and it was noted that a more emissive fuel is more susceptible to the formation of flamelets.

进行数值研究以研究热辐射对低对流航天器环境中接近极限氧气条件的火焰蔓延现象的影响。为了了解火焰辐射热损失的作用，我们进行了一组模拟，其中气体辐射完全被抑制。结果表明，辐射对火焰蔓延速度产生双重影响，取决于氧气浓度。如果火焰有更多的辐射热损失，极限氧浓度增加，小火焰的尺寸减小。据观察，在没有气体辐射的情况下，振荡的近极限火焰稳定并融合成单一火焰。更远，