Most studies of triple flames in counterflowing streams of fuel and oxidizer have been focused on the symmetric problem in which the stoichiometric mixture fraction is 1/2. There then exist lean and rich premixed flames of roughly equal strengths, with a diffusion flame trailing behind from the stoichiometric point at which they meet. In the majority of realistic situations, however, the stoichiometric mixture fraction departs appreciably from unity, typically being quite small. With the objective of clarifying the influences of stoichiometry, attention is focused on one of the simplest possible models, addressed here mainly by numerical integration. When the stoichiometric mixture fraction departs appreciably from 1/2, one of the premixed wings is found to be dominant to such an extent that the diffusion flame and the other premixed flame are very weak by comparison. These curved, partially premixed flames are expected to be relevant in realistic configurations. In addition, a simple kinematic balance is shown to predict the shape of the front and the propagation velocity reasonably well in the limit of low stretch and low curvature.

燃料和氧化剂逆流中的三重火焰的大多数研究都集中在化学计量混合比为1/2的对称问题上。然后存在强度大致相等的稀薄和浓密的预混合火焰，扩散火焰从它们相遇的化学计量点开始向后拖延。然而，在大多数现实情况下，化学计量的混合物分数明显偏离统一性，通常很小。为了澄清化学计量的影响，注意力集中在最简单的可能模型之一上，此处主要通过数值积分解决。当化学计量混合物分数偏离1/2时，通过比较，发现其中一个预混机翼占主导地位，以至于扩散火焰和另一个预混机火焰非常弱。这些弯曲的，部分预混的火焰有望在实际配置中发挥作用。此外，显示了一个简单的运动学平衡，可以在低拉伸和低曲率的极限内很好地预测前部的形状和传播速度。