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Development of an integrated reduced fuel oxidation and soot precursor formation mechanism for CFD simulations of diesel combustion

机译：集成的减少燃料氧化和烟灰前体形成机理的集成，用于柴油机燃烧的CFD模拟

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摘要

In this reported work, a reduced chemical mechanism of surrogate diesel fuel was developed for diesel engine simulations. The aim here was to employ an appropriate reduction scheme to create a compact yet sufficiently comprehensive model which can accurately account for in-cylinder diesel combustion and soot precursor formation processes. The Combustion Engine Research Center (CERC) mechanism of Chalmers University of Technology was used as the base mechanism since this is the most extensively validated and applied mechanism. The reduction scheme involved firstly identifying and then eliminating unimportant species/reactions in the ignition and soot precursor formation processes through the computed production rates and temperature sensitivity coefficients using CHEMKIN-PRO software. Subsequently, reactions were assimilated based on the quasi-steady state assumption (QSSA). The final reduced mechanism, which consists of 109 elementary reactions with 44 species, was first validated under 48 shock tube conditions. Ignition delay (ID) periods predicted by the reduced and base CERC mechanisms were found to be in good agreement, although percentage errors of up to 20% were observed. Further validation was performed by incorporating the reduced mechanism into multi-dimensional CFD code, ANSYS FLUENT through a plug-in chemistry solver, CHEMKIN-CFD. Here, simulation results of combustion characteristics and soot production profiles were compared against data from an experimental study on a heavy-duty, direct injection diesel engine. Simulated peak pressures in cases with short and long ID periods were identical to those recorded from experiments and the maximum ID offset was maintained to within 1 crank angle degree. Spatial and temporal evolutions of in-cylinder soot were also captured successfully in both cases. Significant qualitative relationship between input parameters and soot evolution was elucidated from this study. The implementation of the reduced mechanism has achieved a 38% reduction in computational runtime when compared with that of the base mechanism.
机译：在这项报告的工作中，开发了一种替代柴油的化学机理，用于柴油发动机模拟。此处的目的是采用适当的降低方案来创建紧凑而足够全面的模型，该模型可以准确地说明缸内柴油燃烧和烟灰前体形成过程。查尔默斯工业大学的燃烧发动机研究中心（CERC）机制被用作基本机制，因为这是最广泛验证和应用的机制。减少方案包括首先使用CHEMKIN-PRO软件通过计算出的生产率和温度敏感性系数，识别并消除点火和烟灰前体形成过程中不重要的物种/反应。随后，根据准稳态假设（QSSA）吸收反应。最终的还原机理由109种基本反应与44种物质组成，首先在48个激波管条件下进行了验证。尽管观察到百分比误差高达20％，但发现由减少的CERC机制和基本的CERC机制预测的点火延迟（ID）周期吻合良好。通过将简化的机制通过插入式化学求解器CHEMKIN-CFD纳入多维CFD代码ANSYS FLUENT中，进行了进一步的验证。在此，将燃烧特性和烟灰生成曲线的模拟结果与重型直喷柴油机的实验研究数据进行了比较。 ID周期短和长的情况下模拟的峰值压力与实验记录的峰值压力相同，并且最大ID偏移保持在1个曲柄角度内。在这两种情况下，都成功地捕获了缸内烟灰的时空演变。从这项研究中阐明了输入参数与烟灰演变之间的重要定性关系。与基本机制相比，简化机制的实现使计算时间减少了38％。

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  • 来源
    《Fuel》 |2011年第9期|p.2902-2914|共13页
  • 作者

    Kar Mun Pang; Hoon Kiat Ng; Suyin Gan;

  • 作者单位

    Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia;

    Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia;

    Department of Chemical and Environmental Engineering, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    reduced mechanism; computational fluid dynamics; optical accessible engine; diesel combustion; soot precursor;

    机译：简化机制;计算流体动力学;光学无障碍引擎;柴油燃烧;烟灰前体;

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