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Shock tube and kinetic study on ignition characteristics of lean methane/n-heptane mixtures at low and elevated pressures

Author

Listed:
  • Gong, Zhen
  • Feng, Liyan
  • Wei, Lai
  • Qu, Wenjing
  • Li, Lincheng

Abstract

To acquire ignition control methods for dual-fuel marine engine and HCCI engine, ignition characteristics of lean n-heptane/methane mixture under pressure of 2.0 bar and temperature range from 1241 to 1825 K were studied by shock tube and CHEMKIN with LLNL3.1 mechanism. And ignition processes under temperature range from 700 to 1200 K and pressure range from 40 to 140 bar were investigated by CHEMKIN with NUI mechanism. The results illuminate that at low-pressure high-temperature condition, n-heptane’s replacement and the increase of n-heptane content obviously reduced ignition delay times (IDT). The reduction degree of IDT decreased when n-heptane content was high. N-heptane’s addition also reduced IDT. But this reduction magnitude was less than that of n-heptane’s replacement. Methane’s addition slightly inhibited n-heptane’s auto-ignition. The reaction time of n-heptane was obviously earlier than that of methane. N-heptane decomposition induced radical formation firstly, which triggered subsequent n-heptane’s H-abstraction and the advance of methane’s oxidation. At ultra-high-pressure low-temperature condition, increasing n-heptane’s content enhanced negative temperature coefficient (NTC) behavior. The end time point of complete consumption of two fuels was the same. Low-temperature condition inhibited n-heptane decomposition, with n-heptane’s H-abstraction dominating ignition process.

Suggested Citation

  • Gong, Zhen & Feng, Liyan & Wei, Lai & Qu, Wenjing & Li, Lincheng, 2020. "Shock tube and kinetic study on ignition characteristics of lean methane/n-heptane mixtures at low and elevated pressures," Energy, Elsevier, vol. 197(C).
  • Handle: RePEc:eee:energy:v:197:y:2020:i:c:s0360544220303492
    DOI: 10.1016/j.energy.2020.117242
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    1. 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).
    2. 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).
    3. Myeongsu Yoon & Minsung Choi & Kijoong Kang & Chaeho Oh & Yeseul Park & Gyungmin Choi, 2022. "Effects of n-Heptane/Methane Blended Fuel on Ignition Delay Time in Pre-Mixed Compressed Combustion," Energies, MDPI, vol. 15(11), pages 1-18, June.

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