Wolf G L, Sidebotham G W, Stern J B
State University of New York, Health Science Center at Brooklyn 11203.
Laryngoscope. 1994 Jul;104(7):874-9. doi: 10.1288/00005537-199407000-00018.
Intraluminal combustion in polyvinyl chloride tracheal tubes was investigated. Two flame types were observed: intraluminal and downstream. The flame-spread velocity, burning rate, and equivalence ratio of the intraluminal flame were determined. The products of the intraluminal flame were analyzed, revealing compounds capable of further combustion. Below a certain oxidant flow rate, the tubes do not ignite. At low flow rates that support a flame, the burning rate is minimal and the equivalence ratio reveals no fuel available for the downstream flame, suggesting that ignition of tracheal tubes is least likely in the absence of intraluminal flow. We conclude that the downstream flame is the flame type that is most dangerous and that the intraluminal flame is the generator of fuel and ignition energy for the downstream flame.
对聚氯乙烯气管导管内的燃烧情况进行了研究。观察到两种火焰类型：管腔内火焰和下游火焰。测定了管腔内火焰的火焰传播速度、燃烧速率和当量比。对管腔内火焰的产物进行了分析，发现了能够进一步燃烧的化合物。在低于一定的氧化剂流速时，导管不会点燃。在支持火焰的低流速下，燃烧速率最小，当量比表明没有可供下游火焰使用的燃料，这表明在没有管腔内气流的情况下，气管导管点燃的可能性最小。我们得出结论，下游火焰是最危险的火焰类型，而管腔内火焰是下游火焰的燃料和点火能量的产生源。
