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A numerical and comparative study of the laminar combustion characteristics and kinetics of dimethyl ether and ethanol flames at elevated temperature

机译：升高温度下二甲醚和乙醇火焰的层状燃烧特性和动力学的数值和对比研究

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摘要

Ethanol and DME are the most promising gasoline and diesel alternative fuels among biofuels. In the present study, we conducted a numerical and comparative study of the laminar burning velocity, chemical kinetics and flame instability of DME and ethanol premixed flames at P = 1 bar, T = 408 K and equivalence ratio of 0.8-1.4. The laminar burning velocity and adiabatic flame temperature of DME are higher than ethanol at all equivalence ratios. In addition, acetaldehyde and formaldehyde are the dominant intermediate product of ethanol and DME, respectively. The peak mole fraction of H + OH + CH3 radicals correlates nearly linearly with the laminar burning velocity. The rate-of-production of DME and ethanol suggests that CH3 + O = CH2O + H is the main reaction of CH3 consumption in both DME and ethanol flames. In addition, the reverse reaction of CH3 + O = CH2O + H is enhanced to inhibit the consumption of CH3 due to the high mole fraction of CH2O in DME, which is one of the reasons that the mole fraction of CH3 in DME flame is higher than in ethanol flame. Furthermore, the hydrodynamic and diffusional-thermal instability of DME are both stronger than ethanol because of thinner flame thickness, higher thermal expansion ratio and smaller effective Lewis number.
机译：乙醇和DME是生物燃料中最有前途的汽油和柴油替代燃料。在本研究中，我们对达1巴的DME和乙醇预热火焰的层状燃烧速度，化学动力学和火焰不稳定性进行了数值和比较研究，T = 408k和0.8-1.4的等效比。 DME的层状燃烧速度和绝热火焰温度高于所有等效比率的乙醇。此外，乙醛和甲醛分别是乙醇和DME的主要中间产物。 H + OH + CH3基团的峰值摩尔分数几乎线性地与层状燃烧速度相关。 DME和乙醇的生产率表明CH3 + O = CH2O + H是DME和乙醇火焰中CH3消耗的主要反应。此外，CH3 + O = CH 2 O + H的反应增强以抑制由于DME中CH 2 O的高摩尔分数，这是DME火焰中CH3的摩尔分数较高的原因之一而不是乙醇火焰。此外，由于火焰厚度较薄，较高的热膨胀比和较小的有效lewis数，DME的流体动力和扩散热不稳定性均比乙醇更强。

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  • 来源
    《Fuel》 |2021年第15期|118934.1-118934.11|共11页
  • 作者

    Liu Fushui; Liu Zechang; Sang Zheng; He Xu; Liu Fengshan; Liu Cong; Xu Yuxuan;

  • 作者单位

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China|Collaborat Innovat Ctr Elect Vehicles Beijing Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China|Collaborat Innovat Ctr Elect Vehicles Beijing Beijing 100081 Peoples R China;

    Natl Res Council Canada Metrol Res Ctr Ottawa ON Canada;

    Beijing Inst Technol Sch Mech Engn Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Mech Engn 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; DME; Laminar burning velocity; Chemical kinetics; Flame instability;

    机译：乙醇;DME;层状燃烧速度;化学动力学;火焰不稳定;

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