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首页> 外文期刊>Fuel >Spray evaporation of ethanol-gasoline-like blend and combustion of ethanol-gasoline blend injected by hole-type nozzle for direct-injection spark ignition engines
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Spray evaporation of ethanol-gasoline-like blend and combustion of ethanol-gasoline blend injected by hole-type nozzle for direct-injection spark ignition engines

机译：直喷式火花点火发动机的孔型喷嘴喷射的乙醇-汽油状混合物的喷雾蒸发和乙醇-汽油混合物的燃烧

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摘要

The spray evaporation and combustion characteristics of ethanol-gasoline blends, which consisted of EO (100% gasoline), E85 (85% ethanol and 15% gasoline) and E100 (100% ethanol) were investigated using a hole-type nozzle in a high-temperature and high-pressure quiescent constant volume vessel. A dual-wavelength laser absorption scattering (LAS) technique was employed to differentiate the vapor distribution from the liquid phase. The vapor distribution of gasoline was determined by p-xylene, which had similar physical properties to gasoline and high absorption for ultraviolet. Likewise, the vapor behavior of ethanol was determined by methyl ethyl ketone (MEK). To analyze the flame development and combustion intensity, OH~* chemiluminescence was examined by using real ethanol-gasoline blend under the same calorific value. The result shows that the ethanol evaporates faster than the gasoline. Due to different boiling points, a distinct stratified vapor ambient-gas mixture is formed in the E85 spray. It implies that the low boiling point (LBP) components in gasoline probably evaporate similar to ethanol which is distributed homogeneously along the spray axis. While those of high boiling point (HBP), which are the heavy components in gasoline, would locate from the middle to downstream of the spray, and hence a dense gasoline vapor region is formed at the spray tip after the end of injection (EOI). The analysis of the combustion intensity indicates this phenomenon is one possible reason that leads to the different combustion behaviors between the E85 and E100. After ethanol is added, the combustion becomes more vigorous due to the increase of oxygen content. In addition, the combustion stability is improved by using the ethanol-gasoline blends, especially when the ignition is started at the advanced timing and the middle region of the spray.
机译：使用孔型喷嘴在高温下研究了由EO（100％汽油），E85（85％乙醇和15％汽油）和E100（100％乙醇）组成的乙醇-汽油混合物的喷雾蒸发和燃烧特性。高温高压静态恒容容器。采用双波长激光吸收散射（LAS）技术来区分液相中的蒸汽分布。汽油的蒸气分布由对二甲苯确定，对二甲苯的物理性质与汽油相似，并且对紫外线的吸收率很高。同样，乙醇的蒸气行为由甲乙酮（MEK）确定。为了分析火焰的产生和燃烧强度，在相同的发热量下，使用真正的乙醇-汽油混合物检查了OH〜*的化学发光。结果表明，乙醇的蒸发速度比汽油快。由于沸点不同，在E85喷雾中会形成明显的分层蒸气环境气体混合物。这意味着汽油中的低沸点（LBP）组分可能与乙醇相似地蒸发，乙醇沿喷雾轴均匀分布。虽然高沸点（HBP）是汽油中的重组分，但它们会从喷雾的中部到下游定位，因此在喷射结束（EOI）之后，在喷头形成了浓稠的汽油蒸气区域。燃烧强度的分析表明，这种现象是导致E85和E100之间燃烧行为不同的一种可能原因。加入乙醇后，由于氧气含量的增加，燃烧变得更加剧烈。另外，通过使用乙醇-汽油混合物改善了燃烧稳定性，特别是在提前时间和喷雾的中间区域开始点火时。

著录项

  • 来源
    《Fuel》 |2014年第15期|263-273|共11页
  • 作者

    Run Chen; Keiya Nishida;

  • 作者单位

    Department of Mechanical System Engineering, Graduate School of Engineering, University of Hiroshima, Kagamiyama, Higashi-Hiroshima 739-8527, Japan;

    Department of Mechanical System Engineering, Graduate School of Engineering, University of Hiroshima, Kagamiyama, Higashi-Hiroshima 739-8527, Japan;

  • 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

    Ethanol-gasoline blend; Spray evaporation; Combustion; Constant volume vessel; Hole-type nozzle;

    机译：乙醇汽油混合物;喷雾蒸发;燃烧;恒容容器;孔型喷嘴;

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