Effect of obstacles on explosion characteristics of methane/hydrogen
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摘要: 通过自主搭建的小尺寸实验平台，研究管道内障碍物阻塞率及形状对当量比为1时甲烷/氢气爆炸特性的影响。研究结果表明：相同工况下火焰传播结构基本相似，预混火焰传播路径随障碍物阻塞率增大而变窄；预混火焰传播速度随着障碍物阻塞率与氢气体积分数的增大而上升，也随着障碍物形状的改变而产生变化；最大爆炸超压随着障碍物阻塞率和氢气体积分数的增大而增大，达到最大爆炸超压的时间随着阻塞率的增大而缩短；混合气体在管道内爆炸特性受障碍物与混合气体中氢气体积分数共同影响，氢气体积分数小于50%时，受障碍物与混合气体共同影响，氢气体积分数大于50%时，主要受混合气体燃烧特性影响。此研究能够为甲烷/氢气的安全利用提供理论基础。Abstract: The effects of the blocking rate and shape of obstacles on the explosion characteristics of methane/hydrogen at the stoichiometric mixture were investigated using experimental facilities fabricated by ourselves. The results demonstrate that there are similar trends in the flame evolution structure obtained from all hydrogen fractions for the same condition, i.e. the blocking rate increases as the premixed flame propagation channel become more narrow; the rate of the premixed flame propagation increases along with the blocking rate and hydrogen fraction, and changes with the obstacle shape. Increasing the blocking rate and the hydrogen fraction enhances the maximum overpressure and speeds up the time of the arrival of the maximum overpressure; both the blocking rate and the hydrogen fraction affect the explosion characteristics of methane/hydrogen, and the explosion characteristics are affected by the blocking rate and the hydrogen fraction when the hydrogen fraction comes below 50%, but by the combustion characteristics of the premixed gas when it comes above 50%. This research can provide a theoretical foundation for the safe use of methane/hydrogen fuel.
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Key words:
- blocking rate /
- obstacle shape /
- methane/hydrogen /
- explosion characteristics
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图 2 混合气体氢气体积分数为50%时各工况预混火焰传播图像
Figure 2. Flame evolution structure for various conditions with 50% hydrogen fraction of stoichiometric mixtures
图 3 不同氢气体积分数时工况3预混火焰传播图像
Figure 3. Flame evolution structure for condition 3 with different hydrogen fractions of stoichiometric mixtures
图 4 不同工况下火焰传播参数变化曲线
Figure 4. Flame propagation parameters under different working conditions
图 5 不同氢气质量分数下压力随时间变化曲线
Figure 5. Histories of the measured overpressure with different hydrogen fractions of stoichiometric mixtures
图 6 最大爆炸压力随氢气体积分数变化曲线
Figure 6. Variation of maximum overpressure with hydrogen fractions of stoichiometric mixtures
表 1 预混火焰传播至出口所需时间
Table 1. Time of flame needed to arrive at the vent
φ/% t/ms 工况1 工况2 工况3 工况4 0 34.30 31.95 30.45 28.75 25 25.68 24.95 23.90 22.90 50 19.40 18.45 17.30 16.20 75 11.58 11.30 10.45 9.50 100 5.45 5.40 5.00 5.14 
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