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首页> 外文期刊>Energy Conversion & Management >Study on soot formation characteristics in the diesel combustion process based on an improved detailed soot model
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Study on soot formation characteristics in the diesel combustion process based on an improved detailed soot model

机译：基于改进细化烟尘模型的柴油燃烧过程中烟尘形成特性研究

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Although much research has been done on soot formation in engines, the mechanisms involved in the process are poorly understood and models of the process are overly simplistic. An improved detailed soot model is developed that couples a reduced diesel surrogate fuel chemical reaction mechanism of n-heptane/toluene, implemented into KIVA-3V2 code, for the numerical investigation of soot formation, mass concentration, and size distribution in diesel engines. This detailed soot model incorporates the effects of soot precursors, including isomers of acetylene and polycyclic aromatic hydrocarbons (PAHs), and the physical processes of PAH deposition on the particle surface, soot formation, and particle surface growth. Compared with experiment results in an optical engine and a single-cylinder diesel engine, the improved detailed soot model was effective: the simulated in-cylinder combustion pressure, heat release rate, and ignition timing were in excellent agreement with the experimental results. The simulated two-dimensional, transient distribution of soot concentration was in good agreement with that obtained by using the two-color method, and the simulated changing trend of soot emission was consistent with the experimental results. Therefore, the detailed soot model can be used to accurately simulate and predict soot emission at different conditions in diesel engines. Furthermore, at the initial stage of combustion, large amounts of small-size soot particles were produced by the pyrolysis reactions and polymerization of the hydrocarbon fuel, and the particle size was in the range of 5-40 nm. At the middle stage of combustion, soot particles continued to grow by particle coagulation, surface growth, and the deposition of PAHs, which greatly expanded the particle size range and caused many large-size particles to be produced in the engine cylinder. At the late stage of combustion, the range of particle size distribution stabilized under the influence of further oxidation reactions, and the particle size ranged from 5 to 20 nm. The details of soot-relevant quantities (e.g., particle size, number concentration, and mass) provide valuable insights into soot formation and oxidation processes in diesel engines.
机译：尽管已经对发动机中的烟尘形成进行了大量研究，但是对该过程中涉及的机理了解甚少，并且该过程的模型过于简单。开发了一种改进的详细烟灰模型，该模型结合了已还原的正庚烷/甲苯的柴油替代燃料化学反应机理（已实施为KIVA-3V2代码），用于柴油机中烟灰形成，质量浓度和尺寸分布的数值研究。这个详细的烟灰模型结合了烟灰前体（包括乙炔和多环芳烃（PAHs）的异构体）的影响，以及PAH在颗粒表面沉积，烟灰形成和颗粒表面生长的物理过程。与光学发动机和单缸柴油机的实验结果相比，改进后的详细烟灰模型是有效的：模拟缸内燃烧压力，放热率和点火正时与实验结果非常吻合。模拟的烟尘浓度二维瞬态分布与采用双色法得到的结果吻合良好，烟尘排放的模拟变化趋势与实验结果吻合。因此，详细的烟灰模型可用于精确模拟和预测柴油机在不同条件下的烟灰排放。此外，在燃烧的初始阶段，通过烃类燃料的热解反应和聚合产生大量的小尺寸烟灰颗粒，并且粒径在5-40nm的范围内。在燃烧的中间阶段，烟灰颗粒继续通过颗粒凝结，表面生长和多环芳烃的沉积而增长，这大大扩大了颗粒尺寸范围，并导致在发动机气缸内产生许多大尺寸颗粒。在燃烧的后期，在进一步的氧化反应的影响下，粒径分布的范围趋于稳定，并且粒径在5至20nm的范围内。与烟灰有关的量（例如粒度，数量浓度和质量）的细节为深入了解柴油发动机中的烟灰形成和氧化过程提供了有价值的见解。

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