To study the mechanism of the suppressing effect of Expanded Aluminium (EA) on the premixed gas explosion, premixed methane-air and propane-air gases were undergone explosion reaction in the presence of EA in a self-designed closed pipeline with the overpressures and the compositions, rates and sensitivities of products analyzed. The results showed that the 9.5% methane-air and 5% propane-air explosions produced peak pressures decreased by 79.3% and 65.6%, and residual methane and propane contents increased by 270% and 560% respectively than without EA. In addition, the results revealed that the explosions of propane in the presence of EA produced less methane and carbon oxides contents, but more ethylene and propylene contents. The simulation showed that H, O, and OH are the key factors affecting the rate of products. The product compositions, together with other parameters, suggested that EA decreased temperature, inhibited chain initiation and propagation reaction, but facilitated chain termination reaction by advancing and accelerating the gas phase and wall destruction reaction of radicals, especially collisions and concentration of key free radicals. This new research method based on the analysis of explosion products can be used for in-depth research into gas explosion features and shed light on the suppressing mechanism of EA in flammable gas explosion.

为了研究膨胀铝（EA）抑制预混合气体爆炸的机理，在自设计的封闭管道中，在有EA和超压的条件下，在EA存在下使预混合的甲烷-空气和丙烷-空气发生爆炸反应。所分析产品的组成，比率和敏感性。结果表明，与不使用EA相比，9.5％的甲烷-空气爆炸和5％的丙烷-空气爆炸产生的峰值压力降低了79.3％和65.6％，残留的甲烷和丙烷含量分别增加了270％和560％。此外，结果表明，在EA存在下丙烷爆炸产生的甲烷和碳氧化物含量较少，但乙烯和丙烯含量较高。模拟显示H，O和OH是影响产品速率的关键因素。产物组成以及其他参数表明，EA降低了温度，抑制了链的引发和扩散反应，但通过推进和加速了自由基的气相和壁破坏反应，尤其是碰撞和关键自由基的聚集，促进了链终止反应。这种基于爆炸产物分析的新研究方法，可用于深入研究瓦斯爆炸特性，阐明可燃性气体爆炸中EA的抑制机理。