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首页> 外文期刊>Combustion Science and Technology >A REDUCED CHEMICAL KINETIC MECHANISM FOR LOW TEMPERATURE DIESEL COMBUSTION AND SOOT EMISSIONS
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A REDUCED CHEMICAL KINETIC MECHANISM FOR LOW TEMPERATURE DIESEL COMBUSTION AND SOOT EMISSIONS

机译：降低柴油机燃烧和烟尘排放的化学动力学机理

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摘要

A reduced diesel surrogate fuel chemical kinetic mechanism of n-heptane /toluene / 1-hexene including poly-aromatic hydrocarbons (PAHs) formation was developed for prediction of the diesel combustion process and soot emissions. The proposed mechanism, which includes 60 species and 123 reactions, agrees well with experimental ignition delays in shock tubes. The proposed mechanism was coupled with the KIVA-3V Release 2 computational fluid dynamics (CFD) code to predict the combustion process and soot emissions in constant volume spray chamber and diesel direct injection combustion cases. The simulation results predict the combustion processes for diesel fuel under various conditions well. However, the predicted soot emissions have notable deviations compared to the experimental data when C_2H_2 or phenanthrene (A_3) were chosen as precursors in the soot model at lower oxygen concentration conditions. The predicted soot emissions at different oxygen concentrations have better agreement with the experimental data when pyrene (A4) was chosen as the soot precursor. Compared to C_2H_2 or A_3,A_4 is a more suitable precursor for soot predictions in the LTC simulations. The overall results show that the present mechanism can be used to predict the combustion process and soot emissions of low temperature diesel combustion.
机译：开发了减少的正庚烷/甲苯/ 1-己烯包括聚芳烃（PAHs）形成的柴油替代燃料化学动力学机理，用于预测柴油的燃烧过程和烟尘排放。拟议的机制包括60种和123个反应，与冲击管中的实验点火延迟非常吻合。所提出的机制与KIVA-3V Release 2计算流体力学（CFD）代码结合在一起，可预测在恒容喷雾室和柴油直喷燃烧情况下的燃烧过程和烟尘排放。仿真结果很好地预测了各种条件下柴油的燃烧过程。但是，当在较低的氧气浓度条件下选择C_2H_2或菲（A_3）作为烟灰模型的前体时，与实验数据相比，预测的烟灰排放具有明显的偏差。当选择pyr（A4）作为烟灰前驱物时，在不同氧气浓度下预测的烟灰排放与实验数据更好地吻合。与C_2H_2或A_3相比，A_4更适合用于LTC模拟中的烟尘预测。总体结果表明，该机制可用于预测低温柴油燃烧的燃烧过程和烟尘排放。

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