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

Myeongsu Yoon, Minsung Choi, Kijoong Kang, Chaeho Oh, Yeseul Park and Gyungmin Choi
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Myeongsu Yoon: School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
Minsung Choi: Department of Automotive Engineering, Gangneung-Wonju National University, Wonju 26403, Korea
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

Energies, 2022, vol. 15, issue 11, 1-18

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.

Keywords: ignition delay time; n-heptane; methane; compression ratio; exhaust gas recirculation (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
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