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Flame Propagation Enhancement by Dielectric Barrier Discharge-Generated Intermediate Species

机译：火焰传播通过介电阻挡排出产生的中间物种增强

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摘要

The interaction between nonthermal plasma (NTP) and fuel-air mixtures was studied both experimentally and by means of simulations, to elucidate their promotional effect on flame propagation. A promotional effect on flame propagation velocity was experimentally observed by generating a dielectric barrier discharge (DBD), prior to spark plug ignition of an n-heptane mixture in a high-pressure and -temperature environment, using a rapid compression and expansion machine (RCEM). A novel method of concentration calibration for mass-spectral analysis was conducted, to determine the intermediate species in the fuel-air mixtures passing through the DBD plasma. The effect of the intermediate chemical species on flame propagation was examined numerically using the PREMIX code, with the observed species being considered as initial additives in the calculations. The promotional effect was reproduced numerically with the addition of alkyl hydroperoxide to an n-heptane/air mixture; and the higher the temperature and leaner the mixture in the parameter region, the more pronounced was the effect. The promotional behavior was examined using reaction path analysis, on the basis of which enhanced low-temperature oxidation reactions, due to the dissociation of the alkyl hydroperoxide, were determined in pre-flame region.
机译：实验和通过模拟研究了非热血浆（NTP）和燃料 - 空气混合物之间的相互作用，以阐明它们对火焰繁殖的促进作用。通过快速压缩和膨胀机（RCEM ）。进行了一种新的质谱分析浓度校准方法，以确定通过DBD等离子体的燃料空气混合物中的中间物质。使用预混码在数值上检查中间化学物质对火焰繁殖的影响，观察到的物种被认为是计算中的初始添加剂。用向正庚烷/空气混合物中加入烷基氢氧化烷基烷基/空气混合物来数值进行促进效果;并且温度越高，比参数区域中的混合物较高，效果越明显。使用反应路径分析检查推广行为，基于该反应路径分析，其由于烷基氢过氧化烷烃的解离而增强的低温氧化反应，在预火焰区域中测定。

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