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Shock tube and kinetic study on auto-ignition characteristics of methanol/n-heptane mixtures at high temperature

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  • Li, Lincheng
  • Hu, Mingda
  • Qu, Wenjing
  • Gong, Zhen
  • Feng, Liyan

Abstract

The development of methanol/diesel dual-fuel engines urgently requires further study on chemical kinetic models for binary fuels. Ignition delay of lean and stoichiometric methanol/n-heptane mixtures (30/70, 50/50, 70/30, and 90/10) diluted with argon was investigated at high temperature (T = 1195 K–1514 K) and low pressure (p = 2 bar) using an aerosol shock tube and a detailed LLNL3.1 mechanism. The results indicated that LLNL3.1 mechanism agreed well with the current measurements. An increase in methanol can accelerate the ignition process at Ф = 1, because of the key radical---HO2, produced by CH2OH + O2=CH2O + HO2, which was affected by the methanol concentration. HO2 would subsequently attack the parent fuels and combine with H radical (HO2+H = 2OH), leading to the booming radical pool. For lean mixtures, n-heptane promoted the reactivity of system due to its high sensitivity to reaction H + O2=O + OH. The higher initial O2 concentration expedited this reaction and shortened the IDT. Besides, both methanol and n-heptane undergo H-abstraction reaction mostly by H radical, however, these reactions showed an inhibition effect on reactivity. This is caused by the competition for H radical between O2 and the parent fuels. Also, the fuel radicals, produced by C7H15-3, had a low decomposition reaction rate thus slowing down the chain branching and suppressing the reactivity of system.

Suggested Citation

  • Li, Lincheng & Hu, Mingda & Qu, Wenjing & Gong, Zhen & Feng, Liyan, 2021. "Shock tube and kinetic study on auto-ignition characteristics of methanol/n-heptane mixtures at high temperature," Energy, Elsevier, vol. 233(C).
    • Handle: RePEc:eee:energy:v:233:y:2021:i:c:s0360544221014006
    DOI: 10.1016/j.energy.2021.121152
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    References listed on IDEAS

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    1. Gong, Zhen & Feng, Liyan & Qu, Wenjing & Li, Lincheng & Wei, Lai, 2020. "Auto-ignition characteristics of methane/n-heptane mixtures under carbon dioxide and water dilution conditions," Applied Energy, Elsevier, vol. 278(C).
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    1. Shen, Yazhou & Zhang, Kai & Zhang, Yan & Duwig, Christophe, 2023. "Characterisation of distributed combustion of reformed methanol blends in a model gas turbine combustor," Energy, Elsevier, vol. 272(C).

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