Flame propagation of mixtures of air with high molecular weight neat hydrocarbons and practical jet and diesel fuels

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• 作者：Bo Li ; ^{bl_116@usc.edu} ; Ning Liu ; Runhua Zhao ; Hai Zhang ; Fokion N. Egolfopoulos
• 关键词：n-Tetradecane ; n-Hexadecane ; Jet fuels ; Diesel fuels ; Flame propagation
• 刊名：Proceedings of the Combustion Institute
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：34
• 期：1
• 页码：727-733
• 全文大小：654 K

文摘

Laminar flame speeds of mixtures of air with n-C₁₄H₃₀, n-C₁₆H₃₄, a petroleum-derived JP-5 jet fuel, a camelina-derived hydrotreated renewable JP-5 jet fuel, a petroleum-derived F-76 diesel fuel, and an algae-derived hydrotreated renewable F-76 diesel fuel, were measured in the counterflow configuration at atmospheric pressure and elevated unburned mixture temperatures. Digital particle image velocimetry was used to measure the axial flow velocities along the stagnation streamline. The experiments for n-C₁₄H₃₀/air and n-C₁₆H₃₄/air mixtures were modeled using recently developed kinetic models, and the experimental data were predicted satisfactorily. Both experiments and simulations revealed that the laminar flame speeds of n-C₁₄H₃₀/air and n-C₁₆H₃₄/air mixtures are very close to each other, as expected. On the other hand, the laminar flame speeds for the four practical fuels were found to be lower than n-C₁₄H₃₀ and n-C₁₆H₃₄, due to the presence of aromatics and branched hydrocarbons. Similarly, the laminar flame speeds for the alternative fuels were found to be higher than the petroleum-derived ones, again due to the presence of aromatic compounds in the latter. Further insight into the effects of kinetics and molecular transport was obtained through sensitivity analysis.