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Evaporation of free falling droplets of binary alkane-ethanol blends

机译：二元烷烃 - 乙醇共混物的自由下降液滴的蒸发

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摘要

The admixture of ethanol to gasoline has become a key factor to reduce the reliance on fossil fuels. In this context, the distinct occurrence of component-by-component evaporation compromises the efficient and the low-emission operation of internal combustion engines due to inhomogeneous mixture formation. In order to meet these challenges, a more precise understanding of the mechanisms causing the component-by-component evaporation is inevitable. Therefore, in the present study the evaporation behaviour of binary alkane-ethanol blends has been experimentally investigated. A high-resolution Raman-setup is combined with a fast trigger system to quantify the substance composition of the gaseous phase directly behind free falling droplets. Considerable preparatory work has been carried out to achieve controlled and consistent measurement conditions and to achieve a quantitative and a substance related evaluation under cold start conditions. Binary blends of ethanol and n-hexane, iso-octane or n-decane are studied. A systematic variation of the droplet temperature, the falling distance, the droplet generating frequency and the relative ratios of the applied substances are accomplished. The evaluation demonstrates partially strong component-by-component evaporation dependent on the measurement conditions. Blends of ethanol and hexane in a mixture of 85/15 vol-Wo and of ethanol and decane with 10/90 vol-% show a distinct influenceability of the varied conditions. Furthermore, the results indicate a depletion of the more volatile component at the droplet surface. With increasing temperature, the depletion and the component-by-component evaporation are promoted. Finally, a decisive influence of the droplet spacing, the droplet temperature and the falling distance is described.
机译：乙醇对汽油的混合物已成为减少对化石燃料依赖的关键因素。在这种情况下，由于不均匀的混合物形成，所以逐组分蒸发的不同发生损害了内燃机的有效和低排放操作。为了满足这些挑战，更精确地理解导致逐组分蒸发的机制是不可避免的。因此，在本研究中，二元烷烃 - 乙醇共混物的蒸发行为已经通过实验研究。高分辨率拉曼设置与快速触发系统相结合，以将气相的物质组成直接在自由下降液滴上量化。已经进行了相当大的准备工作来实现控制和一致的测量条件，并在冷启动条件下实现定量和物质相关评估。研究了乙醇和正己烷，异辛烷或正癸烷的二元共混物。完成了液滴温度，下降距离，液滴产生频率和所应用物质相对比的系统变化。评价表明依赖于测量条件的部分强组分逐组分蒸发。乙醇和己烷的混合物在85/15VO和乙醇和10/90体积％的乙醇和癸烷的混合物中显示出不同条件的不同程度的影响。此外，结果表明液滴表面上更挥发性组分的耗尽。随着温度的增加，促进耗尽和组分逐组分蒸发。最后，描述了液滴间隔，液滴温度和下降距离的决定性影响。

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  • 来源
    《Fuel》 |2020年第15期|117869.1-117869.10|共10页
  • 作者

    Hillenbrand T.; Brueggemann D.;

  • 作者单位

    Univ Bayreuth Bayreuth Engine Res Ctr BERC Chair Engn Thermodynam & Transport Proc LTTT Univ Str 30 Bayreuth 95440 Germany;

    Univ Bayreuth Bayreuth Engine Res Ctr BERC Chair Engn Thermodynam & Transport Proc LTTT Univ Str 30 Bayreuth 95440 Germany;

  • 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

    Droplet evaporation; Free falling droplet; Ethanol blend; Raman; Mixture formation; Alternative fuel;

    机译：液滴蒸发;自由下降液滴;乙醇混合;拉曼;混合物形成;替代燃料;

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