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

Minh Tien Nguyen, Luong Van Van, Quoc Thai Pham, Minh Tung Phung and Phu Nguu Do
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Minh Tien Nguyen: Department of Mechanical Engineering, The University of Danang—University of Technology and Education, Da Nang 50000, Vietnam
Luong Van Van: 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

Energies, 2022, vol. 15, issue 5, 1-10

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.

Keywords: ignition energy; hydrogen; lean methane/air mixture; laminar flame speed; ignition delay time; flame rising time (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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