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首页> 外文会议>AIAA aerospace sciences meeting including the new horizons forum and aerospace exposition >Computational Modeling and Experimental Observation of Compositional Stratification in Premixed Flames
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Computational Modeling and Experimental Observation of Compositional Stratification in Premixed Flames

机译：预混火焰成分分层的计算模型与实验观察

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摘要

The structure of premixed propane-air and methane-air flames propagating parallel to a modulated distribution of equivalence ratio was both observed experimentally and modeled using a 2D laminar combustion scheme with reduced chemistry. The flames developed a wrinkled structure with a periodic variation in lift-off height corresponding to the local equivalence ratio. By varying the increment of the compositional stratification and the upstream velocity of the incoming air/fuel mixture, instabilities arising from the interactions of hydrodynamics with diffusive effects in the reaction zone were observed. Discrepancies between computational and experimental results were also observed in the conditions for which the flames became unstable, and potential causes of these discrepancies were considered.
机译：通过实验观察到了预混合的丙烷-空气和甲烷-空气火焰平行于当量比的调制分布而传播的结构，并使用化学性质降低的二维层流燃烧方案进行了建模。火焰形成起皱的结构，其剥离高度对应于局部当量比周期性变化。通过改变组分分层的增量和进入的空气/燃料混合物的上游速度，观察到了由流体动力学与反应区中的扩散效应相互作用引起的不稳定性。在火焰变得不稳定的条件下，还观察到了计算结果与实验结果之间的差异，并考虑了造成这些差异的潜在原因。

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