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首页> 外文会议>2007采矿科学与安全技术国际学术会议 >Numerical Analysis of Overpressure Development Resulting from Premixed Flame in a Vented Tube Filled with Obstacles
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Numerical Analysis of Overpressure Development Resulting from Premixed Flame in a Vented Tube Filled with Obstacles

机译：装有障碍物的通风管中预混火焰导致超压发展的数值分析

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In the present study, the CFD code AutoReaGas was used to simulate overpressure development induced by premixed methane-air mixtures deflagration in vented tubes filled with repeated obstacles. Numerical simulations provide quantitative prediction of overpressures resulting from diverse explosion initiation scenarios. The effects of the blockage ratio of obstacles, methane concentration, ignition position and venting pressure on the variation of explosion overpressures were investigated. The obstacles shaped as plates were adopted here covering blockage ratios ranging from 0.2 to 0.8. Computed results show that the peak overpressures increase along with increasing blockage ratios and venting pressures. When other conditions are uniform, the closer ignition position to the closed end of the tube, the higher the peak overpressures are. The influences of methane concentration on overpressure development are dependent on whether there is an obstacle or not. For the case where no obstacle was used, the peak overpressures obtained are of similar magnitudes with different methane concentration, while for the case with obstacles, the deviation from the stoichiometric condition results in the sharp decrease of peak overpressures.
机译：在本研究中，使用CFD代码AutoReaGas来模拟由充满重复障碍物的排气管中的预混合甲烷-空气混合物爆燃引起的超压发展。数值模拟提供了由多种爆炸起爆场景导致的超压的定量预测。研究了障碍物堵塞率，甲烷浓度，点火位置和排气压力对爆炸超压变化的影响。此处采用形状为平板的障碍物，其遮挡比范围为0.2到0.8。计算结果表明，峰值超压随着堵塞率和排气压力的增加而增加。当其他条件一致时，点火位置越靠近管子的封闭端，峰值过压就越高。甲烷浓度对超压发展的影响取决于是否存在障碍。对于没有使用障碍物的情况，在甲烷浓度不同的情况下，获得的峰值超压具有相似的幅度，而对于有障碍物的情况，与化学计量条件的偏差导致峰值超压的急剧降低。

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