A simplified chemical-kinetic cool-flame mechanism for n-alkanes has recently been developed and applied to the description of quasi-steady droplet combustion. Chemistry of this same general type can support premixed laminar cool-flame deflagrations. The present contribution derives the structure of the associated freely propagating cool premixed flame controlled by the low-temperature chemistry and develops formulas for calculating the corresponding laminar burning velocity. Application of activation-energy asymptotics reveals finite-rate chemistry, among essential intermediates (with concentrations so small that associated heat release is negligible), occurring throughout the preheat zone. There is leakage of both fuel and oxygen through the thin heat-release zone, with zones of consumption of an intermediate species on each side of the heat-release zone, thicker than that zone but still thin compared with the preheat-zone thickness. Predicted laminar burning velocities are compared with recently reported measurements for n-dodecane, performed in a newly designed high-pressure droplet ignition apparatus, resulting in reasonable agreement after account is taken of the process of insertion of the droplet into the furnace and of the velocity of the buoyant plume present in the experiment.

最近开发了一种简化的正构烷烃化学动力学冷焰机理并将其应用于准稳态液滴燃烧的描述。这种一般类型的化学可以支持预混合层流冷焰爆燃。目前的贡献推导了由低温化学控制的相关自由传播的冷预混合火焰的结构，并开发了计算相应层流燃烧速度的公式。活化能渐近的应用揭示了在整个预热区发生的基本中间体（浓度如此之小以至于相关的热量释放可忽略不计）中的有限速率化学。燃料和氧气通过薄热释放区泄漏，在热释放区的每一侧都有一个中间物质的消耗区，比该区厚，但与预热区厚度相比仍然薄。将预测的层流燃烧速度与最近报道的正十二烷测量值进行比较，在新设计的高压液滴点火装置中进行，在考虑液滴插入熔炉的过程和速度后得出合理的一致性实验中存在的浮力羽流。