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Laminar flame speeds of stratified methane, propane, and n-heptane flames

机译：分层甲烷，丙烷和正庚烷火焰的层流火焰速度

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A numerical study on stratified flames of three hydrocarbon fuels, i.e., methane, propane and n-heptane, is conducted using a unsteady, compressible and reacting flow solver ASURF-Parallel. For each fuel, both fuel consumption speeds and flame front propagation speeds of a rich-to-lean stratified flame are compared to those of their corresponding homogeneous flames. For fuel consumption speeds, the methane/air stratified flame is overall faster than those of homogeneous flames due to chemical activities enhanced by key radicals and species from rich burnt gas mixtures. In contrast, stratified flames of both propane/air and n-heptane/air mixtures have lower fuel consumption speeds compared to their homogeneous flames on the rich side, due to reduced level of key radicals consumed by intermediate hydrocarbon species from rich burnt gases. For flame front propagation speeds, stratified flames of all three fuels are found faster than their corresponding homogeneous flames, due to consistently enhanced total heat release rate. Stronger enhancement of laminar flame speeds of stratified mixtures is observed in methane/air mixtures, compared to propane and n-heptane. Burnt gas of rich methane/air mixtures consists of relatively more molecular hydrogen, which assists fuel consumption and heat release at flame front. Moreover, molecular hydrogen has a stronger impact on laminar flame speeds of methane/air mixtures thus an even stronger enhancement on laminar flame speeds of methane/air stratified mixtures is observed. H/C ratio along with local equivalence ratio at flame front are proposed to provide a unique identification of the exact mixture composition of stratified flames. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：使用不稳定，可压缩和反应性的流动求解器ASURF-Parallel对三种烃燃料（即甲烷，丙烷和正庚烷）的分层火焰进行了数值研究。对于每种燃料，将浓到稀分层火焰的燃料消耗速度和火焰前沿传播速度与其对应的均质火焰的速度进行比较。就燃料消耗速度而言，甲烷/空气分层火焰总体上比均质火焰快，这是由于关键自由基和来自丰富燃烧气体混合物的物质增强了化学活性。相反，与浓侧的均质火焰相比，丙烷/空气和正庚烷/空气混合物的分层火焰均具有较低的燃料消耗速度，这是由于中间烃物种从浓燃烧气体中消耗的关键自由基的含量降低了。对于火焰前传播速度，由于总热量释放率不断提高，因此发现所有三种燃料的分层火焰都比其相应的均质火焰快。与丙烷和正庚烷相比，在甲烷/空气混合物中观察到分层混合物的层流火焰速度有更强的增强。富含甲烷/空气混合物的燃烧气体由相对更多的分子氢组成，这有助于燃料消耗和火焰前部的热量释放。此外，分子氢对甲烷/空气混合物的层流火焰速度有更强的影响，因此观察到对甲烷/空气分层混合物的层流火焰速度甚至更强的增强。提出了H / C比值以及火焰前缘的局部当量比值，以便对分层火焰的确切混合物成分提供唯一的标识。 （C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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