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清华大学学报(自然科学版)  2015, Vol. 55 Issue (10): 1135-1142    DOI: 10.16511/j.cnki.qhdxxb.2015.22.015
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四组分汽油替代燃料的化学动力学模型
郑东, 钟北京
清华大学 航天航空学院, 北京 100084
Chemical kinetics model for four-component gasoline surrogate fuels
ZHENG Dong, ZHONG Beijing
School of Aerospace, Tsinghua University, Beijing 100084, China
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摘要 该文通过反应路径分析和灵敏度分析, 发展了甲苯氧化子机理, 进而构建四组分(异辛烷、正庚烷、甲苯、乙醇)汽油替代燃料的化学动力学模型。该模型包含75个组分和305个基元反应。验证结果表明: 该模型不仅能够准确计算单组分燃料的着火延迟时间、火焰传播速度和火焰结构, 而且在一定的压强和温度范围内, 能够较准确地计算多组分汽油替代燃料的着火延迟时间, 反映不同辛烷值汽油的自燃特性。该文提出的四组分汽油替代燃料动力学模型包含较少的组分数与基元反应数, 更有利于在汽油燃烧的多维计算流体动力学(CFD)模拟中得到应用。
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郑东
钟北京
关键词 替代燃料着火延迟时间火焰传播速度动力学模型甲苯    
Abstract:The sub-mechanism of toluene oxidation was identified using path and sensitivity analyses. A chemical kinetics mechanism for a four-component gasoline surrogate fuel made of iso-octane/n-heptane/ethanol/toluene includes 75 species and 305 elementary reactions. The validated results show that the mechanism gives good agreement with experimental data for the pure fuel ignition delay time, laminar flame speed, and chemical structure predictions. The model also predicts the ignition delay time of multi-component gasoline surrogate fuels in the specified pressure and temperature range and reproduces the auto-ignition characteristics of different research octane number (RON) gasoline fuels. Since this chemical kinetics model has few species and few reactions, the mechanism can be used in multidimensional, computational fluid dynamics (CFD) simulations of the gasoline combustion.
Key wordssurrogate fuel    ignition delay time    laminar flame speed    kinetic model    toluene
收稿日期: 2013-12-02      出版日期: 2015-11-16
ZTFLH:  TK418.9  
基金资助:国家自然科学基金项目(51036004)
通讯作者: 钟北京,教授,E-mail:zhongbj@tsinghua.edu.cn     E-mail: zhongbj@tsinghua.edu.cn
作者简介: 郑东(1987-),男(汉),陕西,博士研究生。
引用本文:   
郑东, 钟北京. 四组分汽油替代燃料的化学动力学模型[J]. 清华大学学报(自然科学版), 2015, 55(10): 1135-1142.
ZHENG Dong, ZHONG Beijing. Chemical kinetics model for four-component gasoline surrogate fuels. Journal of Tsinghua University(Science and Technology), 2015, 55(10): 1135-1142.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2015.22.015  或          http://jst.tsinghuajournals.com/CN/Y2015/V55/I10/1135
  表1 5种汽油替代燃料的组成成分和比例
  图1 甲苯氧化主要路径
  图2 未修正模型和修正模型计算的甲苯火焰传播速度、着火延迟时间与实验结果比较
  图3 甲苯火焰传播速度灵敏度分析
  图4 甲苯温度灵敏度分析
  表2 修正的反应和动力学参数
  图5 PRF着火延迟时间计算值与实验值比较
  图6 乙醇着火延迟时间计算值与实验值比较
  图7 甲苯着火延迟时间计算值与实验值比较
  图8 异辛烷、正庚烷、乙醇火焰传播速度计算值与实验值比较
  图9 甲苯火焰传播速度计算值与实验值比较
  图10 甲苯重要组分计算值与实验值[29]比较
  图11 SurrogateA 着火延迟时间计算值与实验值比较
  图12 SurrogateB着火延迟时间计算值与实验值比较
  图13 SurrogateC着火延迟时间计算值与实验值比较
  图14 SurrogateD 着火延迟时间计算值与实验值比较
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