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在水平管道式气体爆炸装置中,选取5种不同浓度的甲烷进行爆炸实验,研究在甲烷爆炸传播过程中,最大爆炸压力、压力上升速率及压力峰值时间随甲烷浓度及传播距离的变化规律。研究结果表明:甲烷浓度对最大爆炸压力、压力上升速率和压力峰值时间的影响显著:甲烷浓度越接近化学当量浓度,最大爆炸压力和压力上升速率越大,压力峰值时间越短。随着传播距离的增大,最大爆炸压力和压力上升速率先增大再减小,压力峰值时间则依次延长。甲烷浓度偏离化学当量浓度越多,压力峰值时间成倍延长。
In a horizontal pipeline gas explosion device, five different concentrations of methane were selected for explosion experiment. The maximum explosion pressure, the rate of pressure rise and the peak pressure of pressure during methane explosion propagation were studied with the variation of methane concentration and propagation distance. The results show that the effect of methane concentration on the maximum explosion pressure, pressure rise rate and pressure peak time is significant. The closer the methane concentration is to the stoichiometric concentration, the higher the maximum explosion pressure and pressure rise rate, the shorter the pressure peak time. With the increase of propagation distance, the maximum explosion pressure and pressure rise rate first increased and then decreased, and the peak pressure time prolonged in turn. Methane concentrations deviate from the stoichiometric concentration, the pressure peak time doubled.