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Discrete multicomponent model for biodiesel spray combustion simulation

机译：离散多组分模型用于生物柴油喷雾燃烧模拟

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摘要

An important first step in spray combustion simulation is an accurate determination of the fuel properties which affects the modelling of spray formation and reaction. In a practical combustion simulation, the implementation of a multicomponent model is important in capturing the relative volatility of different fuel components. A Discrete Multicomponent (DM) model is deemed to be an appropriate candidate to model a composite fuel like biodiesel which consists of four components of fatty acid methyl esters (FAME). In this paper, the DM model is compared with the traditional Continuous Thermodynamics (CTM) model for both diesel and biodiesel. The CTM model is formulated based on mixing rules that incorporate the physical and thermophysical properties of pure components into a single continuous surrogate for the composite fuel. The models are implemented within the open-source CFD code OpenFOAM, and a semi-quantitative comparison is made between the predicted spray-combustion characteristics and optical measurements of a swirl-stabilised flame of diesel and biodiesel. The DM model performs better than the CTM model in predicting a higher magnitude of heat release rate in the top flame brush region of the biodiesel flame compared to that of the diesel flame. Using both the DM and CTM models, the simulation successfully reproduces the droplet size, volume flux, and droplet density profiles of diesel and biodiesel. The DM model predicts a longer spray penetration length for biodiesel compared to that of diesel, as seen in the experimental data. Also, the DM model reproduces a segregated biodiesel fuel vapour field and spray in which the most abundant FAME component has the longest vapour penetration. In the biodiesel flame, the relative abundance of each fuel component is found to dominate over the relative volatility in terms of the vapour species distribution and vice versa in the liquid species distribution.
机译：喷雾燃烧模拟中重要的第一步是准确确定影响喷雾形成和反应模型的燃料特性。在实际的燃烧模拟中，多组分模型的实现对于捕获不同燃料组分的相对挥发性很重要。离散多组分（DM）模型被认为是对复合燃料（如生物柴油）进行建模的合适候选者，该生物燃料由脂肪酸甲酯（FAME）的四个组分组成。本文将DM模型与柴油和生物柴油的传统连续热力学（CTM）模型进行了比较。 CTM模型是根据混合规则制定的，该混合规则将纯净组分的物理和热物理性质合并为复合燃料的单个连续替代物。这些模型在开源CFD代码OpenFOAM中实现，并且在预测的喷雾燃烧特性与柴油和生物柴油的旋流稳定火焰的光学测量之间进行了半定量比较。 DM模型在预测生物柴油火焰的顶部火焰刷区域中的放热速率比柴油火焰更高时，比CTM模型表现更好。使用DM和CTM模型，该模拟成功地再现了柴油和生物柴油的液滴尺寸，体积通量和液滴密度分布。如实验数据所示，DM模型预测生物柴油的喷雾渗透长度比柴油更长。此外，DM模型重现了分离的生物柴油燃料蒸汽场和喷雾，其中最丰富的FAME组分具有最长的蒸汽渗透性。在生物柴油火焰中，发现每种燃料组分的相对丰度在蒸气种类分布方面占相对挥发度的主导，而在液体种类分布中则相反。

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  • 来源
    《Fuel》 |2014年第15期|44-54|共11页
  • 作者

    M.F. Mohd Yasin; R.S. Cant; C.T. Chong; S. Hochgreb;

  • 作者单位

    Fakulti Kejuruteraan Mekanikal, Universiti Teknologi Malaysia, Malaysia,Department of Engineering, University of Cambridge, United Kingdom;

    Fakulti Kejuruteraan Mekanikal, Universiti Teknologi Malaysia, Malaysia;

    Department of Engineering, University of Cambridge, United Kingdom;

    Fakulti Kejuruteraan Mekanikal, Universiti Teknologi Malaysia, 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

    Multicomponent; Biodiesel; Spray; Simulation; CFD;

    机译：多组分生物柴油喷雾;模拟;差价合约;

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