Experimental and numerical investigation of DDT in hydrogen–Air behind a single obstacle
Experimental and numerical investigation of DDT in hydrogen–Air behind a single obstacle
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DOI：
10.1016/j.ijhydene.2012.03.168
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发表时间：
2012-11
影响因子：
7.2
通讯作者：
A. Gaathaug;K. Vaagsaether;D. Bjerketvedt
中科院分区：
文献类型：
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作者：
A. Gaathaug;K. Vaagsaether;D. Bjerketvedt
对氢气-空气混合物中燃烧转爆轰（DDT）过程进行了二维数值模拟，并与实验结果进行了比较。所研究的几何形状是3米长的方形通道。一端是封闭的，在距离末端1米处放置了一个障碍物，另一端向大气开放。在封闭端点燃混合物。实验和模拟表明，DDT发生在障碍物后1 m范围内。爆震的开始跟随一系列的局部爆炸发生在远离火焰前缘的火焰和壁之间的未燃烧反应物层中。在实验中还看到了局部爆炸，压力记录表明可能还有更多。此外，在实验和模拟中观察到局部爆炸，但没有引爆。爆炸应具有足够的强度，并应在足够高的层中爆炸，以导致爆炸。数值分辨率为0.5毫米每平方米的细胞，并在该文件中提供的燃烧模型的进一步细节。
Two-dimensional numerical simulations of deflagration-to-detonation transition (DDT) in hydrogen–air mixtures are presented and compared with experiments. The investigated geometry was a 3 m long square channel. One end was closed and had a single obstacle placed 1 m from the end, and the other end was open to the atmosphere. The mixture was ignited at the closed end. Experiments and simulations showed that DDT occurred within 1 m behind the obstacle. The onset of detonation followed a series of local explosions occurring far behind the leading edge of the flame in a layer of unburned reactants between the flame and the walls. A local explosion was also seen in the experiments, and the pressure records indicated that there may have been more. Furthermore, local explosions were observed in the experiments and simulations which did not detonate. The explosions should have sufficient strength and should explode in a layer of sufficient height to result in a detonation. The numerical resolution was 0.5 mm per square cell, and further details of the combustion model used are provided in the paper.