中文摘要：

为了研究聚氨酯泡沫材料阴燃向明火转化的影响因素，通过改变其宽度、厚度和密度进行多次实验．结果表明，聚氨酯泡沫材料宽度的加大，碳氧化放出的热量增多，所以宽度达到某一值时更容易从阴燃向明火转化．聚氨酯泡沫由阴燃向明火转化不仅取决于长度、宽度而且还与厚度有密切关系，当厚度达到某一尺寸时，温度也会整体跃升，最后向明火转化．密度大的聚氨酯泡沫材料氧化产生的热量多，中心易蓄积热量，达到气相反应所需温度，最终使阴燃向明火转化，而密度小的则相反．

英文摘要：

In order to understand the impact factors of transition from smoldering to flaming combustion, the width, thickness and density of polyurethane foam material were changed several times in the experiments. The results show that with the width increased, the surface area and the air flow rate which access to the inside of material also increase, the quantity of oxygen is sufficient, and the heat release quantity by carbon oxidation increases. When the width reaches a certain value, polyurethane foam material transforms easier from smoldering to flaming combustion. That polyurethane foam transforms to the flaming combustion not only depends on the length, width size but also relates to the thickness closely. When thickness reached a certain size, the temperature also reaches a whole jump, and the material transforms to the flaming combustion finally. The oxidation of larger density polyurethane foam material produces more heat, and then heat accumulates in the polyurethane foam center to the required temperature of gas phase reaction, and ultimately the foam material transforms to flaming combustion from smoldering.