This study numerically investigates the combustion characteristics in a swirl burner for CO-H₂ syngas by large eddy simulation. Firstly, experimental data are used to verify the applicability of the Boivin mechanism and the Sandia mechanism. The simulation results show that the Boivin mechanism predicts a more reasonable flame structure. Then, Syngas25, Syngas45, and Syngas100 (composed of 25%, 45%, and 100% H₂ by volume, respectively) are set to numerically investigate the effect of hydrogen addition ratio on combustion characteristics by using the dynamic Smagorinsky model and the partially stirred reactor model. The detailed simulation data shows that the addition of hydrogen greatly influences the flame structure and flow field; with an increase in hydrogen addition, the flame length shortens, the temperature rises, and flashback caused by combustion induced vortex breakdown occurs. Furthermore, the precessing vortex core cannot exist stably in Syngas100, though it can be clearly observed in other cases.

这项研究通过大涡模拟数值研究了旋流燃烧器中CO-H ₂合成气的燃烧特性。首先，实验数据被用来验证Boivin机制和Sandia机制的适用性。仿真结果表明，Boivin机制可预测更合理的火焰结构。然后，合成气25，合成气45和合成气100（由25％，45％和100％H _2组成通过使用动态Smagorinsky模型和部分搅拌的反应堆模型，分别设置以体积计）以数值研究氢添加比率对燃烧特性的影响。详细的模拟数据表明，氢的加入对火焰的结构和流场有很大的影响。随着氢气添加量的增加，火焰长度缩短，温度升高，并发生由燃烧引起的涡旋破坏而引起的回火。此外，进动涡旋核在Syngas100中不能稳定存在，尽管在其他情况下也可以清楚地观察到。