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High-pressure vaporization modeling of multi-component petroleum-biofuel mixtures under engine conditions

机译：发动机工况下多组分石油-生物燃料混合物的高压汽化模型

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摘要

Numerical simulation of the vaporization of multi-component liquid fuels under high-pressure conditions is conducted in this study. A high-pressure drop vaporization model is developed by considering the high-pressure phase equilibrium which equates the fugacity of each component in both liquid and vapor phases. Peng-Robinson equation of state is used for the calculation of fugacity. To model the vaporization of diesel fuel under high-pressure conditions, continuous thermodynamics based on a gamma distribution is coupled with phase equilibrium by correlating the parameters of the equation of state with the molecular weights of the continuous components. The high-pressure vaporization model is validated using the experimental data of n-heptane drops under different ambient pressures and temperatures. Good levels of agreement are obtained in drop size history. Predicted results of the vaporization of diesel fuel drops show that increasing ambient pressure leads to a shorter drop lifetime under high temperature conditions (e.g., 900K). On the other hand, at a slightly lower temperature of 700 K, the drop lifetime increases as the ambient pressure increases. It is found that the net affects of high ambient pressure on drop vaporization are determined by two competing factors, namely, reduced mass transfer number and reduced enthalpy of vaporization. The model was further applied to biodiesel and its blends with diesel fuel. The fuel blend is modeled based on a method that continuous thermodynamics is used to model diesel fuel and biodiesel is modeled as a mixture of its five representative components. Results of single drop vaporization history show that drop lifetime increases as the volume fraction of biodiesel in the fuel blend increases. This phenomenon reveals the low vaporization rate of biodiesel that has a higher critical temperature than diesel fuel. It is also observed that the volume fraction of biodiesel in the fuel blend increases during vaporization and its vapor concentrates near the tip of the liquid spray while diesel fuel vapor is around the entire liquid spray.
机译：本研究对高压下多组分液体燃料的蒸发进行了数值模拟。通过考虑高压相平衡来建立高压降汽化模型，该平衡使液相和气相中每种组分的逸度相等。 Peng-Robinson状态方程用于计算逸度。为了模拟高压条件下柴油的汽化，通过将状态方程的参数与连续组分的分子量相关联，将基于伽马分布的连续热力学与相平衡相结合。使用正庚烷液滴在不同环境压力和温度下的实验数据验证了高压汽化模型。在墨滴大小历史记录中可以获得良好的一致性。柴油滴的汽化的预测结果表明，增加的环境压力导致在高温条件下（例如900K）的滴寿命缩短。另一方面，在700 K的较低温度下，液滴的寿命随着环境压力的增加而增加。发现高环境压力对液滴蒸发的净影响是由两个竞争因素决定的，即降低的传质数和降低的蒸发焓。该模型进一步应用于生物柴油及其与柴油的混合物。基于以下方法对燃料混合物进行建模：使用连续热力学对柴油进行建模，将生物柴油建模为其五个代表性成分的混合物。单滴汽化历史的结果表明，随着燃料混合物中生物柴油的体积分数增加，液滴寿命也增加。这种现象表明，临界温度比柴油高的生物柴油的汽化率低。还观察到，燃料混合物中的生物柴油在汽化期间的体积分数增加，并且其蒸汽集中在液体喷雾的尖端附近，而柴油燃料蒸汽围绕整个液体喷雾。

著录项

  • 来源
    《Combustion and Flame》 |2011年第9期|p.1705-1717|共13页
  • 作者

    Lei Zhang; Song-Charng Kong;

  • 作者单位

    Department of Mechanical Engineering, Iowa State University, 2025 Black Engineering Building, Ames, IA 50011, USA;

    Department of Mechanical Engineering, Iowa State University, 2025 Black Engineering Building, Ames, IA 50011, USA;

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

    multi-component vaporization; phase equilibrium; high-pressure effect; diesel-biodiesel blend;

    机译：多组分汽化;相平衡高压作用柴油-生物柴油混合物;

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