Cao Yong, Qian Feifu, Xi Peng, Wang Jiasheng, An Yuanyuan
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, Henan, China.
ACS Omega. 2025 Jul 1;10(27):29827-29835. doi: 10.1021/acsomega.5c04428. eCollection 2025 Jul 15.
The experiments and simulations of vented hydrogen-air mixture explosions in the tube are investigated with the influence of the obstacle. The internal pressure curves of different hydrogen concentrations are analyzed in the presence of an obstacle. The internal overpressure has two obvious overpressure peaks without an obstacle. As the obstacles are placed in the tube, the maximum internal pressure is markedly elevated. Two maximum overpressures of the 16 cm obstacle and 9 cm obstacle are just same, the internal pressure curve has multiple overpressure peaks in the presence of the 16 cm obstacle. The presence of obstacles has influenced the duration of the vented hydrogen-air mixtures. In the presence of obstacles, the location changes of the flame propagation location have marked sudden decreases. The sudden decrease corresponds to a secondary increase of flame propagation. The maximum flame length with presence of 16 cm obstacle is the longest. Simulated results show that the area of the flame notably increased with the effect of the obstacle. As the burning mixture approached the obstacle, the flame was stretched of the shape, and the integral structure was segmented into two flame fronts. It can be found that the presence of the obstacle will speed up flame propagation.
研究了管道中带障碍物时氢气 - 空气混合气体泄爆的实验和模拟，分析了存在障碍物时不同氢气浓度下的内部压力曲线。无障碍物时内部超压有两个明显的超压峰值。当在管道中放置障碍物时，最大内部压力显著升高。16厘米障碍物和9厘米障碍物的两个最大超压相同，存在16厘米障碍物时内部压力曲线有多个超压峰值。障碍物的存在影响了氢气 - 空气混合气体泄爆的持续时间。存在障碍物时，火焰传播位置的变化有明显的突然下降。这种突然下降对应着火焰传播的二次增加。存在16厘米障碍物时的最大火焰长度最长。模拟结果表明，障碍物作用下火焰面积显著增大。当燃烧混合物接近障碍物时，火焰形状被拉伸，整体结构被分割成两个火焰前沿。可以发现，障碍物的存在会加速火焰传播。
