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首页> 外文期刊>Energies >Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel
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Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel

机译：恒定体积容器在不同氢分数下稀混合气的稀混合气火焰的细胞不稳定性研究

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An experimental study of the intrinsic instabilities of H2/CO lean (φ = 0.4 to φ = 1.0) premixed flames at different hydrogen fractions ranging from 0% to 100% at elevated pressure and room temperature was performed in a constant volume vessel using a Schlieren system. The unstretched laminar burning velocities were compared with data from the previous literature and simulated results. The results indicate that excellent agreements are obtained. The cellular instabilities of syngas-air flames were discussed and critical flame radii were measured. When hydrogen fractions are above 50%, the flame tends to be more stable as the equivalence ratio increases; however, the instability increases for flames of lower hydrogen fractions. For the premixed syngas flame with hydrogen fractions greater than 50%, the decline in cellular instabilities induced by the increase in equivalence ratio can be attributed to a reduction of diffusive-thermal instabilities rather than increased hydrodynamic instabilities. For premixed syngas flames with hydrogen fractions lower than 50%, as the equivalence ratio increases, the cellular instabilities become more evident because the enhanced hydrodynamic instabilities become the dominant effect. For premixed syngas flames, the enhancement of cellular instabilities induced by the increase in hydrogen fraction is the result of both increasing diffusive-thermal and hydrodynamic instabilities.
机译：进行了H 2 / CO稀薄（φ= 0.4至φ= 1.0）预混火焰在高压和室温下在0％至100％的不同氢含量范围内的固有不稳定性的实验研究使用Schlieren系统在恒定体积的容器中将未拉伸的层流燃烧速度与先前文献的数据和模拟结果进行了比较。结果表明获得了很好的协议。讨论了合成气-空气火焰的细胞不稳定性，并测量了临界火焰半径。当氢含量高于50％时，当当量比增加时，火焰趋于稳定。但是，氢含量较低的火焰的不稳定性增加。对于氢分数大于50％的预混合合成气火焰，当量比增加引起的细胞不稳定性的下降可归因于扩散热不稳定性的降低而不是流体动力学不稳定性的提高。对于氢含量低于50％的预混合成气火焰，当当量比增加时，由于增强的水动力不稳定性成为主要作用，因此细胞不稳定性变得更加明显。对于预混合成气火焰，氢分数增加引起的细胞不稳定性增强是扩散热和流体力学不稳定性增加的结果。

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