隧道环境下多组分气体爆炸特性的试验研究

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Experimental Study on Explosion Characteristics of Multicomponent Gases in Tunnels

ZHANG Hongfei  ， SONG Xianzhao， ZHOU Long，DENG Shuxin，LU Hao，LI Yi ， XIA Mengtao， CHEN Danhe

① School of Safety Science and Enginering，Nanjing Universityof Science and Technology （Jiangsu Nanjing，210094）

② State Key Laboratoryof Disaster Prevention and Mitigation of Explosion and Impact，Army Enginering Universityof PLA（Jiangsu Nanjing，210007） （204号 ③ School of Civil Engineering， Southeast University（Jiangsu Nanjing， 211189） ④ School of Mechanical Engineering，Nanjing University of Science and Technology（Jiangsu Nanjing，210094）

[ABSTRACT]To addressthe insuffcient research on the explosion hazards of thermal runaway gases from new energy vehicle powerbateries intunnels，smal-scalepipeline experiments weredesigned tosimulate theexplosionofleaked gases frombatery thermal runawayintunnels.Explosioncharacteristics of single-componentand multi-componentcombustible gases at different stoichiometric concentrations were investigated，as wellas the effcts of varying blockage ratios σBR and the number of obstacles n0 in a straight pipeline.The simulation results indicate that，for H2 -air mixtures without obstacles， theexplosion pressre initially increasesand then decreases with the increase of concentration，reachingamaximumof 705.7 kPa at φH2=60% . In H2 -CH -2 -air mixtures，the explosion pressure also exhibits a trend of first increasing and then decreasing with the increase of hydrogen fraction X ，attaining a maximum pressure of 420.2 kPa when X is 0.9 二 n0 has diffrent effects on the explosion characteristics of mixed gases with different H2 concenlrations. When φH2 is 20% with a constant σBR ，the peak overpressure first increases and then decreases as the n0 rises. At φH2=30% ，the peak overpressure continuously increases. But at φH2=50% ，it consistently decreases.Additionally，under constant φH2 and n0 ，the peak

overpressure tends to decrease with increasing σBR [KEYWORDS]tunnel; power batery;combustible gas；obstacle；explosion overpressure

0 引言

在双碳目标背景下，我国电池行业发展迅速在储能电池中，磷酸铁锂电池凭借轻便化、能量密度高、转换效能高、寿命长等特点获得了广泛应用[1-2]但是由于锂电池在过充过放、机械冲击、短路等情况下，容易导致电池内部发生热化学反应，引起电池热失控，导致燃烧爆炸事故[3-4]，磷酸铁锂电池同样具有很大的安全隐患。（剩余12566字）