Influence of geometry on flame acceleration and DDT in H2-CO-air mixtures in a partially obstructed channel
Influence of geometry on flame acceleration and DDT in H2-CO-air mixtures in a partially obstructed channel
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DOI：
10.1016/j.jlp.2021.104493
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发表时间：
2021-05-03
影响因子：
3.5
通讯作者：
Sattelmayer, Thomas
中科院分区：
文献类型：
--
作者：
Heilbronn, Daniel;Barfuss, Christoph;Sattelmayer, Thomas
在阻塞率为60%、间距为300 mm的部分阻塞通道中，前人对火焰加速和爆燃转爆轰(DDT)的研究表明，在氢气-空气混合物中添加CO会对火焰加速、DDT和由此产生的峰值压力产生影响。在这项研究中，改变了通道的障碍物结构，以便进一步研究CO对火焰动力学的影响。阻塞率设置为30%和60%，而障碍物之间的间距在100到300毫米之间变化。试验台是一个六米长、截面为矩形的小型航道。燃料在100/0、75/25和50/50H-2/CO之间变化。总的燃料含量在空气中燃料的15-40体积-%范围内变化。然后对火焰速度和动态压力进行了评估。根据燃料组成和燃料含量，提出了均相H-2-CO-空气混合物中滴滴涕的限值。这一结果扩展了Veser等人提供的关于火焰加速和DDT的现有数据。(2002)，并可用于验证数值框架。
Previous studies of flame acceleration and deflagration-to-detonation transition (DDT) in a partially obstructed channel applying a blockage ratio of 60% and a spacing of 300 mm showed that the addition of CO to H-2-air mixtures can have an impact on flame acceleration, DDT and the resulting peak pressures. In this study, the obstacle configuration of the channel is varied to enable further investigation of the influence of CO on flame dynamics. Blockage ratios are set to 30% and 60%, while the spacing between the obstacles is varied between 100 and 300 mm. The test rig is a small-scale six-meter-long channel with a rectangular cross section. The fuel is varied between 100/0, 75/25 and 50/50 H-2/CO. The overall fuel content is varied within the range 15-40 vol.-% fuel in air. The flame speeds and dynamic pressures are then evaluated. Limits for DDT in homogeneous H-2-CO-air mixtures are presented with regards to fuel composition and fuel content. The results extend the existing data on flame acceleration and DDT provided by Veser et al. (2002) and can be used to validate numerical frameworks.