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Numerical study on exergy losses of iso-octane constant-volume combustion with water addition

机译：用水加入异辛烷恒定燃烧损失的数值研究

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摘要

A numerical study on exergy losses in the iso-octane auto-ignition processes with water addition was conducted in an adiabatic constant-volume system. Detailed chemical mechanism of iso-octane was used in the chemical kinetic simulation, under variable initial temperatures, equivalence ratios and water to fuel ratios. The cooling, dilution, thermal and chemical effects of water addition on the exergy losses in four reaction stages, defined as the fuel-series reaction stage, the fuel fragment reaction stage, the H2O2 loop reaction stage and the H-2-O-2 reaction stage were analyzed, respectively. The cooling effect was the most influential factor, which increased the exergy losses from the first to third reaction stages, but the increase magnitude was reduced at higher initial temperatures. The dilution effect increased the exergy losses in all the four reaction stages. The thermal effect also increased the exergy losses of the four reaction stages due to the decrease of temperature. However, its influence could be almost negligible compared to the other three effects. The chemical effect decreased the exergy losses in the fuel fragment reaction stage at both low and high initial temperatures. On the other hand, the exergy losses caused by the incomplete combustion products and combustion intermediates were decreased by the cooling, dilution and thermal effects while increased by the chemical effect of water addition. In general, the four effects on the exergy losses from incomplete combustion products and combustion intermediates were greater than those on the exergy losses from chemical reactions, therefore the total exergy losses in the isooctane auto-ignition processes exhibited a declination trend with water addition, e.g. a decrease by 5% at a higher initial temperature.
机译：在绝热恒定体积系统中进行了对水加入的异辛烷自动点火过程中偏僻损失的数值研究。在化学动力学模拟中使用异辛烷的详细化学机制，在可变的初始温度，等效比率和水中提供给燃料比。水的冷却，稀释，热和化学效应在四个反应阶段的漏胀损失，定义为燃料级反应阶段，燃料片段反应阶段，H2O2环反应阶段和H-2-O-2分别分析反应阶段。冷却效果是最有影响力的因素，从第一至第三反应阶段增加了漏胀损失，但在较高的初始温度下，增加的幅度降低。稀释效果在所有四个反应阶段增加了漏胀损失。由于温度降低，热效应也增加了四个反应级的漏洞。然而，与其他三种效果相比，其影响几乎可以忽略不计。化学效果在低初始温度和高初始温度下降低了燃料片段反应阶段的漏极损失。另一方面，通过冷却，稀释和热效果降低了由不完全燃烧产物和燃烧中间体引起的漏洞损失，同时通过水的化学效果增加。一般而言，对不完全燃烧产物和燃烧中间体的漏洞损失的四种影响大于化学反应的漏洞损失的影响，因此异辛烷自燃过程中的总丧失损失表现出水的赤纬趋势，例如，水平呈下降趋势。在初始温度较高的情况下降低5％。

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  • 来源
    《Fuel》 |2019年第jul15期|127-135|共9页
  • 作者

    Pan Fengjiao; Zhang Jiabo; Han Dong; Lu Tian;

  • 作者单位

    Shanghai Jiao Tong Univ Key Lab Power Machinery & Engn Minist Educ Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Key Lab Power Machinery & Engn Minist Educ Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Key Lab Power Machinery & Engn Minist Educ Shanghai 200240 Peoples R China;

    Shanghai Marine Diesel Engine Res Inst Shanghai 201203 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

    Water addition; Exergy loss; Auto-ignition; Iso-octane; Chemical kinetics; Second law of thermodynamics;

    机译：水加入;漏洞;自动点火;异辛烷;化学动力学;热力学的第二律;

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