A gas explosion travel experiment was conducted in a closed pipeline of DN700 mm with gas-air mixed gas under the conditions of the different ignition energy. The experiment results showed that the flame travel speed of the gas explosion from the explosion location would be steadily increased with the travel distance increased and the max value of the flame travel speed would be reached at the location near the exit. The higher ignition energy was and the higher flame travel speed would be. When the ignition was certain, the flame travel speed of gas explosion and pipeline length and diameter ration would be in a logarithmic function relationship. When the pipeline length and diameter ratio was certain, the flame travel speed of gas explosion and ignition energy would be in a quadratic funetion relationship.%在封闭的DN700 mm管道的瓦斯一空气混合气体中,进行了不同点火能量条件下的瓦斯爆炸传播试验,试验结果表明:瓦斯爆炸火焰传播速度从起爆位置开始随着传播距离的加长而逐渐增大,在靠近出口附近处达到最大值;点火能量越大,火焰传播速度也越大;在点火能量一定时,瓦斯爆炸火焰传播速度与管道长径比呈对数函数关系;在管道长径比一定时,瓦斯爆炸火焰传播速度与点火能量呈二次函数关系.
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