An experimental investigation of flammability limits of hydrogen, methane and propane in air and oxygen at reduced pressures was carried out. A slow influence of sizes of an experimental vessel of a diameter higher than 125 mm on the flammability limits was revealed, but an influence of a type of an oxidizer (air or oxygen) and an ignition energy is significant. Critical values of an initial pressure for a possibility of a flame propagation were determined. The limiting values of the ignition energy were determined, for which an elevation of this parameter does not influence the critical pressure and the flammability region. A qualitative interpretation of obtained experimental results is given, which is based on a peculiarities of a flame initiation.

进行了在减压下空气和氧气中氢，甲烷和丙烷的可燃极限的实验研究。揭示了直径大于125mm的实验容器的尺寸对可燃性极限的缓慢影响，但是氧化剂的类型（空气或氧气）和点火能量的影响是显着的。确定了用于火焰传播可能性的初始压力的临界值。确定了点火能量的极限值，对于该极限值，该参数的升高不影响临界压力和可燃性区域。给出了对获得的实验结果的定性解释，该解释基于火焰起爆的特殊性。