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Effect of Ignition Energy and Hydrogen Addition on Laminar Flame Speed, Ignition Delay Time, and Flame Rising Time of Lean Methane/Air Mixtures

Author

Listed:
  • Minh Tien Nguyen

    (Department of Mechanical Engineering, The University of Danang—University of Technology and Education, Da Nang 50000, Vietnam)

  • Van Van Luong

    (Faculty of Automotive Engineering Technology, Vinh Long University of Technology Education, Vinh Long 85000, Vietnam)

  • Quoc Thai Pham

    (Faculty of Transportation, The University of Danang—University of Science and Technology, Da Nang 50000, Vietnam)

  • Minh Tung Phung

    (Department of Mechanical Engineering, The University of Danang—University of Technology and Education, Da Nang 50000, Vietnam)

  • Phu Nguu Do

    (Department of Mechanical Engineering, The University of Danang—University of Technology and Education, Da Nang 50000, Vietnam)

Abstract

A series of experiments were performed to investigate the effect of ignition energy (E ig ) and hydrogen addition on the laminar burning velocity ( S u 0 ), ignition delay time ( t delay ), and flame rising time ( t rising ) of lean methane−air mixtures. The mixtures at three different equivalence ratios ( ϕ ) of 0.6, 0.7, and 0.8 with varying hydrogen volume fractions from 0 to 50% were centrally ignited in a constant volume combustion chamber by a pair of pin-to-pin electrodes at a spark gap of 2.0 mm. In situ ignition energy (E ig ∼2.4 mJ ÷ 58 mJ) was calculated by integration of the product of current and voltage between positive and negative electrodes. The result revealed that the S u 0 value increases non-linearly with increasing hydrogen fraction at three equivalence ratios of 0.6, 0.7, and 0.8, by which the increasing slope of S u 0 changes from gradual to drastic when the hydrogen fraction is greater than 20%. t delay and t rising decrease quickly with increasing hydrogen fraction; however, t rising drops faster than t delay at ϕ = 0.6 and 0.7, and the reverse is true at ϕ = 0.8. Furthermore, t delay transition is observed when E ig > E ig,critical , by which t delay drastically drops in the pre-transition and gradually decreases in the post-transition. These results may be relevant to spark ignition engines operated under lean-burn conditions.

Suggested Citation

  • Minh Tien Nguyen & Van Van Luong & Quoc Thai Pham & Minh Tung Phung & Phu Nguu Do, 2022. "Effect of Ignition Energy and Hydrogen Addition on Laminar Flame Speed, Ignition Delay Time, and Flame Rising Time of Lean Methane/Air Mixtures," Energies, MDPI, vol. 15(5), pages 1-10, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1940-:d:765975
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    References listed on IDEAS

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    1. Jung, Dongwon & Sasaki, Kosaku & Iida, Norimasa, 2017. "Effects of increased spark discharge energy and enhanced in-cylinder turbulence level on lean limits and cycle-to-cycle variations of combustion for SI engine operation," Applied Energy, Elsevier, vol. 205(C), pages 1467-1477.
    2. Tsuboi, Seima & Miyokawa, Shinji & Matsuda, Masayoshi & Yokomori, Takeshi & Iida, Norimasa, 2019. "Influence of spark discharge characteristics on ignition and combustion process and the lean operation limit in a spark ignition engine," Applied Energy, Elsevier, vol. 250(C), pages 617-632.
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    Cited by:

    1. Maria Mitu & Codina Movileanu & Venera Giurcan, 2022. "The Laminar Burning Velocities of Stoichiometric Methane–Air Mixture from Closed Vessels Measurements," Energies, MDPI, vol. 15(14), pages 1-17, July.
    2. Simon Drost & Sven Eckart & Chunkan Yu & Robert Schießl & Hartmut Krause & Ulrich Maas, 2023. "Numerical and Experimental Investigations of CH 4 /H 2 Mixtures: Ignition Delay Times, Laminar Burning Velocity and Extinction Limits," Energies, MDPI, vol. 16(6), pages 1-17, March.

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