A skeletal mechanism for biodiesel blend surrogates combustion
A skeletal mechanism for biodiesel blend surrogates combustion
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DOI：
10.1016/j.enconman.2014.02.012
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发表时间：
2014-05-01
影响因子：
10.4
通讯作者：
Chua, K. J.
中科院分区：
文献类型：
--
作者：
An, H.;Yang, W. M.;Chua, K. J.
针对柴油机燃烧生物柴油的问题，提出了由癸酸甲酯、9-癸烯酸甲酯和正庚烷组成的三组分骨架反应机理。它包括112种参与498个反应的CO，NOx和烟尘形成机制嵌入。在这项研究中，一个详细的三组分生物柴油的机制被用来作为开始的机制还原和还原的机制相结合，与先前开发的骨架反应机制，正庚烷集成的碳烟形成动力学。采用有向关系图误差传播和灵敏度分析（DRGEPSA）、峰浓度分析、异构体集总、不重要反应剔除和反应速率调整等方法进行机理简化。生物柴油的还原过程中进行了一系列的初始条件，包括压力从1到100大气压，当量比从0.5到2.0和温度从700到1800 K，而对于正庚烷，点火延迟预测进行了比较，对17激波管实验条件。通过0-D点火延迟测试和3-D发动机模拟对开发的骨架反应机制进行了广泛的验证。结果表明，该机理能够准确预测正庚烷和生物柴油的滞燃期，并可用于发动机三维数值模拟，预测生物柴油的燃烧特性。因此，所建立的112组分骨架机理能够准确模拟详细反应机理中的重要反应途径，适用于生物柴油、柴油及其混合燃料的柴油机燃烧模拟。(C)2014爱思唯尔有限公司版权所有。
A tri-component skeletal reaction mechanism consisting of methyl decanoate, methyl-9-decenoate, and n-heptane was developed for biodiesel combustion in diesel engine. It comprises 112 species participating in 498 reactions with the CO, NOx and soot formation mechanisms embedded. In this study, a detailed tri-component biodiesel mechanism was used as the start of mechanism reduction and the reduced mechanism was combined with a previously developed skeletal reaction mechanism for n-heptane to integrate the soot formation kinetics. A combined mechanism reduction strategy including the directed relation graph with error propagation and sensitivity analysis (DRGEPSA), peak concentration analysis, isomer lumping, unimportant reactions elimination and reaction rate adjustment methods was employed. The reduction process for biodiesel was performed over a range of initial conditions covering the pressures from 1 to 100 atm, equivalence ratios from 0.5 to 2.0 and temperatures from 700 to 1800 K, whereas for n-heptane, ignition delay predictions were compared against 17 shock tube experimental conditions. Extensive validations were performed for the developed skeletal reaction mechanism with 0-D ignition delay testing and 3-D engine simulations. The results indicated that the developed mechanism was able to accurately predict the ignition delay timings of n-heptane and biodiesel, and it could be integrated into 3-D engine simulations to predict the combustion characteristics of biodiesel. As such, the developed 112-species skeletal mechanism can accurately mimic the significant reaction pathways of the detailed reaction mechanism, and it is suitable to be used for diesel engine combustion simulations fueled by biodiesel, diesel and their blend fuels. (C) 2014 Elsevier Ltd. All rights reserved.