The self-built test platform for studying explosion characteristics of combustible gas was used to study the influence of different addition amount of argon gas on explosion pressure, flame propagation speed and structure of flame front plane with 4.5％ propane-air premixed gas. The results showed that: The maximum explosive pressure and flame propagation velocity gradually decreased, when the volume fraction of argon in the premixed gas increased. Under the condition of 37％ argon gas volume fraction, premixed gas did not explode, and argon gas played a role of complete explosion suppression. In addition, when the argon gas volume fraction was less than 24％, the"tulip"flame structure was formed in the process of propagation of the flame, and its occurrence time lagged with the increase of the argon gas volume fraction. When argon gas volume fraction was greater than or equal to24％, no"tulip"flame was formed in the process of flame propagation.%利用自行搭建的用于研究可燃气体爆炸特性试验平台,研究不同氩气添加量对4.5％丙烷-空气预混气爆炸压力、火焰传播速度及火焰前锋阵面结构的影响.结果表明:当预混气中氩气体积分数升高时,最大爆炸压力及火焰传播速度逐渐减小.当氩气体积分数达到37％时,预混气体不再发生爆炸,氩气起到完全抑爆的作用.当氩气体积分数＜24％时,火焰在传播过程中形成"郁金香"形火焰结构,并且此结构出现时间随氩气体积分数增大而滞后;当氩气体积分数≥24％时,在火焰传播过程中未形成"郁金香"形火焰.
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