Abstract The dynamic behaviour of periodic laminar premixed acetylene-air flames in a micro-channelled combustor consisting of an array of five planar rectangular channels was found to be influenced by the equivalence ratio and flow-rate of the continuously and steadily injected premixed fuel charge. Three distinct flame stages were observed — planar, chaotic and trident, which were strongly correlated to the flow dynamics. The effect of the flow on the flame behaviour was investigated by characterizing the cold flow in a scaled-up model channel with the same aspect ratio as the combustion micro-channel. Direct flow visualization using flow tracers and quantitative velocity-field data from PIV measurements showed both an increase in the bottom recirculation zone reattachment length (along the floor of the channel) and a decrease in the lateral recirculation zone reattachment length (along the sides of the channel) with increasing flow Reynolds number. Comparison of the flow and flame transition locations downstream of the injection point suggested that the location of trident flame onset coincides with the flow bottom recirculation zone reattachment length. The planar-chaotic flame transition location was observed to be influenced by the homogeneity of the mixture downstream of the injection plane.

中文翻译：

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微通道燃烧器中流动的实验研究及其与火焰行为的关系

摘要 发现由五个平面矩形通道阵列组成的微通道燃烧器中周期性层流预混乙炔-空气火焰的动态行为受连续稳定喷射的预混燃料的当量比和流量的影响。观察到三个不同的火焰阶段——平面、混沌和三叉戟，它们与流动动力学密切相关。通过表征与燃烧微通道具有相同纵横比的放大模型通道中的冷流，研究了流动对火焰行为的影响。使用流动示踪剂和来自 PIV 测量的定量速度场数据的直接流动可视化显示，底部再循环区再附着长度（沿通道底部）增加，横向再循环区再附着长度（沿通道两侧）减少。通道）随着流动雷诺数的增加。喷射点下游的流动和火焰过渡位置的比较表明，三叉戟火焰开始的位置与流动底部再循环区再附着长度一致。观察到平面-混沌火焰过渡位置受喷射平面下游混合物均匀性的影响。喷射点下游的流动和火焰过渡位置的比较表明，三叉戟火焰开始的位置与流动底部再循环区再附着长度一致。观察到平面-混沌火焰过渡位置受喷射平面下游混合物均匀性的影响。喷射点下游的流动和火焰过渡位置的比较表明，三叉戟火焰开始的位置与流动底部再循环区再附着长度一致。观察到平面-混沌火焰过渡位置受喷射平面下游混合物均匀性的影响。