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Droplet combustion of blended fuels with alcohol and biodiesel/diesel in microgravity condition

机译：混合燃料与酒精和生物柴油/柴油的微滴燃烧

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摘要

Based on a drop tower built in the lab space, an environment of reduced gravity was employed to study the droplet combustion of multi-component fuels, specifically of diesel mixed with alcohol (methanol, ethanol, and 2-propanol) and biodiesel. The falling duration was about 0.68 s and was sufficient for complete burning of a droplet with a diameter as small as 0.5 mm that was suspended at the crossing point of two ultra-thin fibers with a diameter of 2.5 μm The fibers were made of ceramics with low heat conductivity and imposed negligible interference on the droplet that was less subject to deformation as compared to large droplets that were usually tested. In the study, biodiesel was not added merely as an alternative fuel to diesel, but also to provide an interface for the mixing of alcohol and diesel. In the lack of asymmetric convection that was generically rendered by buoyancy or external flow, the burning characteristics were investigated with alleviated complexity while a soot shell could be formed under the flame surface with spherical symmetry. The work can hence be adopted for qualitative understanding of soot formation at the first place, for which quantitative measurement may not be directly performed on the spot, for different fuel mixtures. It was found that the addition of alcohol in a diesel-biodiesel mixture could enhance the burning rate, reduce the preheating delay, and mitigate pollution of soot particles as well as the tendency to form rigid layers. Furthermore, the introduction of microexplosion through the mixing with alcohol of much higher volatility may lead to substantial disintegration and faster combustion of fuel droplets.
机译：基于在实验室空间中建造的升降塔，采用降低重力的环境来研究多组分燃料的液滴燃烧，特别是混合了乙醇（甲醇，乙醇和2-丙醇）和生物柴油的柴油的液滴燃烧。下降持续时间约为0.68 s，足以完全燃烧直径为0.5 mm的液滴，该液滴悬浮在直径为2.5μm的两根超细纤维的交点处。与通常测试的大液滴相比，低的热导率和对液滴的干扰可忽略不计，变形较少。在这项研究中，不仅添加了生物柴油作为柴油的替代燃料，而且还为酒精和柴油的混合提供了接口。在缺乏通常由浮力或外部流动引起的不对称对流的情况下，以降低复杂性的方式研究了燃烧特性，同时可以在火焰表面下形成球形对称的烟灰壳。因此，该工作可以首先用于定性地了解烟灰的形成，对于不同的燃料混合物，可能无法直接在现场进行定量测量。已经发现，在柴油-生物柴油混合物中添加醇可以提高燃烧速度，减少预热延迟，减轻烟灰颗粒的污染以及形成刚性层的趋势。此外，通过与挥发性高得多的醇混合而引入微爆可能导致大量崩解和燃料小滴的更快燃烧。

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  • 来源
    《Fuel》 |2013年第11期|757-765|共9页
  • 作者

    Kuo-Long Pan; Ming-Chun Chiu;

  • 作者单位

    Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC;

    Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan, ROC;

  • 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 combustion; Microgravity; Biodiesel; Alcohol; Microexplosion;

    机译：液滴燃烧;微重力生物柴油醇;微爆;

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