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首页> 外文期刊>Fuel >Quantitative measurement of mixture formation in an impinging spray of ethanol-gasoline blend under cold-start condition via UV-Vis dual-wavelength laser absorption scattering (LAS) technique
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Quantitative measurement of mixture formation in an impinging spray of ethanol-gasoline blend under cold-start condition via UV-Vis dual-wavelength laser absorption scattering (LAS) technique

机译：通过UV-Vis双波长激光吸收散射（LAS）技术在冷启动条件下乙醇 - 汽油混合物中混合物形成混合物形成的定量测量

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摘要

Ethanol is considered as the most promising alternative fuel for gasoline, however, the ethanol-gasoline blends used in gasoline engines usually suffer to cold-start difficulties due to the poor mixture formation. While the spray-wall interaction plays a significant role in determining the mixture formation in direct-injection spark-ignition engines (DISI), particularly for the injection occurring near the top dead center (TDC). In this study, the mixture formation of ethanol-gasoline impinging spray (E0, E85 and E100) under cold-start condition for DISI engines were investigated in a constant volume vessel. An ultraviolet (UV) - visible (Vis) dual-wavelength laser absorption scattering (LAS) technique was used to quantitatively measure the liquid and vapor phase distributions respectively. Both the toluene and methyl ethyl ketone (MEK) with the similar physical properties to gasoline and ethanol respectively, as well as with high absorption for ultraviolet were used to determine the vapor and liquid distributions. Two wall temperatures (T-w) of 298 K and 273 K were set to represent typical coldstart conditions. The results show that E100 evaporates faster than E0 before spray impingement. After impingement, E100 exhibits more sensitivity to the wall temperature, and it evaporates faster at near-wall region under T-w = 298 K. For E85 impinging spray, the evaporation of high boiling point component in gasoline is slower under T-w = 298 K than that under T-w = 273 K, probably as a result of the evaporative cooling effect by ethanol component which has higher vaporization of enthalpy. Furthermore, the results indicated that a number of liquid droplets of heavy components in gasoline remain at near-wall region as fuel film. The evaporation characteristics of E85 is significantly enhanced at the initial period of spray impingement under cold-start condition, which is potential to improve the cold-start performance.
机译：乙醇被认为是汽油最有前途的替代燃料，然而，由于混合物形成差，汽油发动机中使用的乙醇 - 汽油共混物通常遭受冷启动困难。虽然喷雾壁相互作用在确定直喷火花点火发动机（DISI）中的混合物形成时起着重要作用，但特别是在顶部死亡中心（TDC）附近发生的喷射。在该研究中，研究在恒定体积容器中在冷启动条件下在冷启动条件下形成乙醇 - 汽油撞击（E0，E85和E100）的混合物。使用紫外（UV）可见（VIS）双波长激光吸收散射散射（LAS）技术分别测量液体和气相分布。使用甲苯和甲基乙基酮（MEK）分别具有与汽油和乙醇相似的物理性质以及高吸收的紫外线，以确定蒸气和液体分布。 298 k和273 k的两个壁温度（T-W）被设定为表示典型的冷轧镖条件。结果表明，在喷雾冲击之前，E100比E0更快地蒸发。在冲击后，E100对壁温具有更高的敏感性，并且在TW = 298K下近壁区域蒸发更快。对于E85撞击喷雾，汽油中的高沸点组分的蒸发比其慢= 298 k较慢在TW = 273 k下，可能是由于乙醇组分的蒸发冷却效果，其焓升高。此外，结果表明，汽油中的重量成分的许多液滴保留在近壁区域作为燃料膜。在冷启动条件下的喷雾冲击的初始时期，E85的蒸发特性显着提高，这是提高冷启动性能的潜力。

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  • 来源
    《Fuel》 |2020年第15期|116685.1-116685.13|共13页
  • 作者

    Chen Run; Nishida Keiya; Shi Baolu;

  • 作者单位

    Chiba Univ Grad Sch Engn Dept Mech Engn Inage Ku 1-33 Yayoi Cho Chiba Chiba 2638522 Japan;

    Univ Hiroshima Grad Sch Engn Dept Mech Syst Engn Higashihiroshima 7398527 Japan;

    Beijing Inst Technol Sch Aerosp Engn 5 Zhongguancun South St Beijing 100081 Peoples R China;

  • 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 blends; Impinging spray; Cold-start condition; Laser absorption scattering;

    机译：乙醇 - 汽油混合;撞击喷雾;冷启动条件;激光吸收散射;

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