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Effects of n-Heptane/Methane Blended Fuel on Ignition Delay Time in Pre-Mixed Compressed Combustion

Author

Listed:
  • Myeongsu Yoon

    (School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
    These authors contributed equally to this work.)

  • Minsung Choi

    (Department of Automotive Engineering, Gangneung-Wonju National University, Wonju 26403, Korea
    These authors contributed equally to this work.)

  • Kijoong Kang

    (H&A Company, LG Electronics, Changwon 51533, Korea)

  • Chaeho Oh

    (H&A Company, LG Electronics, Changwon 51533, Korea)

  • Yeseul Park

    (School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea)

  • Gyungmin Choi

    (School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea)

Abstract

This study analyzed factors that influence the ignition delay characteristics of n-heptane/methane-blended fuel. The effects of chemical species, exhaust gas recirculation rate, compression ratio, cool/hot flames, and combustion chamber conditions (temperature, pressure, and O 2 concentration) were determined and analyzed using CHEMKIN Pro. The experiment conditions for verification were 550–1000 K at 15 bar with 50% H 2 /50% CH 4 fuel. The main combustion reactions were confirmed through reactivity analysis and sensitivity analysis on the ignition delay time. The ignition delay time at 14.7% O 2 concentration was significantly higher than that at 21% O 2 concentration by more than 30%. In addition, a higher ratio of methane in the blended fuel increased the ignition delay time as a result of methane dehydrogenation, delaying the ignition of heptane.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:11:p:4081-:d:829986
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    References listed on IDEAS

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    3. Maria Mitu & Domnina Razus & Volkmar Schroeder, 2021. "Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of p ( t ) Records in a Spherical Vessel," Energies, MDPI, vol. 14(22), pages 1-16, November.
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    5. 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).
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