Many previous studies have investigated the mechanism of backdraft, focusing on the flammable gas concentration. However, there still exists a question: whether temperature is influential. This study visited this topic with compartment fires in the “fully developed fire period” and under-ventilated, i.e. after flashover and before “decay period”. It was the first research investigating backdraft with compartment fires in which the door was open during this fully-developed fire period. The compartment fires were fuel-rich, and fit the theoretical definition of backdraft. The compartment size was 0.8 m (L) × 0.4 m (W) × 0.4 m (H), and the size of the opening was 0.4 m (W) × 0.13 m (H). The fuel was wood cribs. The time to flashover was 350 s after ignition, and the door was closed at 450 and 510 s. The doorway closing duration was 60, 120 and 240 s. Experimental results reveal that the compartment temperature declined as the doorway closure duration increased. The likelihood of backdraft consequently decreased, and the time to backdraft occurrence after opening the door (delay time) increased. Backdraft became more difficult to achieve as the compartment temperature decreased. This observation may be caused by weak gravity current generated due to low compartment temperature. Consequently the compartment temperature is influential in the occurrence of backdraft.

先前的许多研究都研究了回燃的机制，重点关注可燃气体浓度。然而，仍然存在一个问题：温度是否有影响。本研究探讨了“火灾完全发展期”和通风不足时（即闪络之后和“衰变期”之前）的隔间火灾的主题。这是第一项研究在火势完全发展期间舱门打开的情况下发生回燃火灾的研究。舱室火灾燃料丰富，符合逆燃的理论定义。隔室尺寸为0.8 m（长）×0.4 m（宽）×0.4 m（高），开口尺寸为0.4 m（宽）×0.13 m（高）。燃料是木床。闪络时间为点火后350秒，并在450秒和510秒时关门。门口关闭持续时间分别为 60、120 和 240 秒。实验结果表明，随着门口关闭时间的增加，车厢温度下降。因此，发生逆气流的可能性降低，并且开门后发生逆气流的时间（延迟时间）增加。随着隔间温度的降低，回燃变得更加困难。这种现象可能是由于舱室温度低而产生的微弱重力流造成的。因此，室温度对回燃的发生有影响。