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A quasi-discrete model for heating and evaporation of complex multicomponent hydrocarbon fuel droplets

机译：复杂多组分烃类燃料液滴加热和蒸发的准离散模型

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摘要

A quasi-discrete model for heating and evaporation of complex multicomponent hydrocarbon fuel droplets is suggested and tested in Diesel engine-like conditions. The model is based on the assumption that properties of components are weak functions of the number of carbon atoms in the components (n). The components with relatively close n are replaced by the quasi-components with properties calculated as average properties of the a priori defined groups of actual components. Thus the analysis of heating and evaporation of droplets consisting of many components is replaced by the analysis of heating and evaporation of droplets consisting of relatively few quasi-components. In contrast to previously suggested approaches to modelling the heating and evaporation of droplets consisting of many components, the effects of temperature gradient and quasi-component diffusion inside droplets are taken into account. The model is applied to Diesel fuel droplets, approximated as a mixture of 21 components CnH2n+2 for 5 ≤n ≤ 25, which correspond to a maximum of 20 quasi-components with average properties for n = nj and n = nj+1, where j varies from 5 to 24. It is pointed out that droplet surface temperatures and radii, predicted by a rigorous model taking into account the effect of all 20 quasi-components, are very close to those predicted by the model, using just five quasi-components. Errors due to the assumptions that the droplet thermal conductivity and species diffusivities are infinitely large cannot be ignored in the general case.
机译：提出了一种用于复杂多组分烃类燃料液滴加热和蒸发的准离散模型，并在类似于柴油机的条件下进行了测试。该模型基于组分的性质是组分（n）中碳原子数的弱函数的假设。 n相对接近的组件被准组件替换，这些准组件的属性计算为先验定义的实际组件组的平均属性。因此，由许多组分组成的液滴的加热和蒸发的分析被由相对较少的准组分组成的液滴的加热和蒸发的分析所代替。与先前建议的模拟由许多组分组成的液滴加热和蒸发的方法相反，考虑了温度梯度和液滴内部准组分扩散的影响。该模型应用于柴油燃料滴，近似为21个组分CnH2n + 2的混合物，其中5≤n≤25，对应于最多20个准组分，其平均性质为n = nj和n = nj + 1，其中，j从5到24不等。要指出的是，考虑到所有20个准分量的影响，由严格模型预测的液滴表面温度和半径与仅由5个准分量预测的液滴表面温度和半径非常接近。 -组件。在一般情况下，不能忽略由于液滴热导率和物质扩散率无限大的假设而引起的误差。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第20期|p.4325-4332|共8页
  • 作者

    S.S. Sazhin; A.E. Elwardany; E.M. Sazhina; M.R. Heikal;

  • 作者单位

    Sir Harry Ricardo Laboratories, Centre for Automotive Engineering, School of Computing, Engineering and Mathematics, Faculty of Science and Engineering University of Brighton,Brighton BN2 4GJ, UK;

    Sir Harry Ricardo Laboratories, Centre for Automotive Engineering, School of Computing, Engineering and Mathematics, Faculty of Science and Engineering University of Brighton,Brighton BN2 4GJ, UK;

    Sir Harry Ricardo Laboratories, Centre for Automotive Engineering, School of Computing, Engineering and Mathematics, Faculty of Science and Engineering University of Brighton,Brighton BN2 4GJ, UK;

    Sir Harry Ricardo Laboratories, Centre for Automotive Engineering, School of Computing, Engineering and Mathematics, Faculty of Science and Engineering University of Brighton,Brighton BN2 4GJ, UK;

  • 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 droplets; heating; evaporation; diesel fuels; modelling;

    机译：多组分液滴;加热;蒸发;柴油;建模;

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