Previous studies of flame acceleration and deflagration-to-detonation transition (DDT) in a partially obstructed channel applying a blockage ratio of $\text{60}\text{\%}$ and a spacing of 300 mm showed that the addition of CO to H₂-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 $\text{30}\text{\%}$ and $\text{60}\text{\%}$, 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 H₂/CO. The overall fuel content is varied within the range $\text{15-40}\text{vol.-\%}$ fuel in air. The flame speeds and dynamic pressures are then evaluated. Limits for DDT in homogeneous H₂-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.

先前对部分阻塞通道中的火焰加速和爆燃-爆轰过渡（DDT）的研究，其阻塞比为 $\text{60}\text{％}$300  mm的间距表明，向H _2-空气混合物中添加CO会对火焰加速度，DDT和产生的峰值压力产生影响。在这项研究中，改变通道的障碍物构型可以进一步研究CO对火焰动力学的影响。封锁率设定为$\text{30}\text{％}$ 和 $\text{60}\text{％}$，而障碍物之间的间距则在100到300毫米之间变化。该试验台是一条六米长的小通道，具有矩形横截面。燃料在100 / 0、75 / 25和50/50 H ₂ / CO之间变化。总燃料含量在此范围内变化$\text{15-40}\text{体积％}$空气中的燃料。然后评估火焰速度和动压力。针对燃料成分和燃料含量，提出了均相H ₂ -CO-空气混合物中DDT的限值。结果扩展了由Veser等提供的有关火焰加速和DDT的现有数据。（2002年），可用于验证数值框架。