RP-3航空煤油/正丁醇混合燃料燃烧机理构建及动力学分析

Construction of Chemical Reaction Mechanism and Kinetic Analysis of RP-3 Aviation Kerosene/n-Butanol Blended Fuel

关键词:  航空煤油  正丁醇  点火  燃烧机理  化学反应机理  化学动力学  敏感性分析

Key words:  Kerosene  n-Butanol  Ignition  Combustion mechanism  Chemical reaction mechanism  Chemical kinetics  Sensitivity analysis

摘要:

为探究大分子碳氢/小分子醇类燃料氧化机理，明晰航空煤油/生物质替代燃料的燃烧本质，构建并验证了包含173种组份、720步反应的RP-3航空煤油/正丁醇混合燃料反应机理，并对其在压力为0.1MPa、当量比为1.0、温度为1100，1300，1500K条件下进行了化学动力学模拟分析。结果表明：在低温条件下，正丁醇会延长混合燃料着火延迟期，30%的掺醇比使混合燃料着火延迟期延长了101.3μs；烷烃脱氢后的异构体以及裂解后的小分子基元团都随温度的升高而增多，正丁醇的添加对大分子异构化及裂解过程影响较小；温度的升高使除R1（H+O₂=O+OH）外的大部分反应的敏感性系数显著降低并保持在30%以内。而正丁醇的添加使消耗OH，HO₂等物质的反应的敏感性系数提高，也会影响小分子基元团的摩尔分数。

Abstract:

To investigate the oxidation mechanism of large molecule hydrocarbon/small molecule alcohol fuel and to clarify the combustion nature of kerosene/biomass alternative fuel，the reaction mechanism of RP-3 kerosene/n-butanol mixed fuel containing 173 species and 720 reactions was constructed and validated. And chemical kinetic simulation analysis was performed under atmospheric pressure at equivalence ratio of 1.0 and at temperature of 1100， 1300 and 1500K. The results show that under low temperature， n-butanol prolongs the ignition delay time （IDT） of the mixed fuel， and 30% alcohol ratio can extend IDT of the mixed fuel by 101.3μs. The alkane isomers after dehydrogenation and the small molecule groups after cracking all raise with temperature enhance. The n-butanol has little effect on the isomerization and cracking process of large molecules. The sensitivity coefficient of most reactions except R1 reaction （H+O₂=O+OH） are significantly reduced and kept within 30%. The addition of n-butanol increases the sensitivity coefficient of the reaction that consumes OH， HO₂ and others， and it also affects the mole fraction of small molecules.