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Effects of fuel composition and exhaust gas recirculation on ignition delay characteristics of n-heptane/hydrogen blended fuel

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Abstract

The autoignition characteristics of n-heptane/hydrogen were investigated numerically. The effects of the temperature, fuel compositions and Exhaust gas recirculation (EGR) on the autoignition characteristics were evaluated. The numerical study on the ignition delay time was performed using the CHEMKIN-PRO software to calculate ignition delay time and predict the chemical species in the combustion process. The results revealed that ignition delay time decreased with an increase in the hydrogen fraction in the mixture in low temperature regime, but the opposite behavior observed in high temperature regime. The oxidation reaction of n-heptane in low temperature regime is limited with increasing mole fraction of hydrogen in blended fuel. Thus, cool flame which is characteristics of n-heptane is weakened. As consumption rate of n-heptane and temperature are decreased, total reactivity is decreased. The ignition delay time sharply decrease with EGR due to intermediate species in the exhaust gas.

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, Busan, 609-735, Korea

    Kijoong Kang, Chaeho Oh, Gyungmin Choi & Duckjool Kim

  2. Commercial Ship Engineering, Piping Design, Samsung Heavy Industry Co., LTD., Geoje, Gyeongsangnamdo, 656-710, Korea

    Taeyoung Shim

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  1. Kijoong Kang
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  2. Taeyoung Shim
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  3. Chaeho Oh
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  4. Gyungmin Choi
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Correspondence to Gyungmin Choi.

Additional information

Recommended by Associate Editor Jeong Park

Kijoong Kang received received his B.S. and M.S. in Aerospace Engineering from Sunchon National University in 2010 and 2012, respectively. He now enrolled a doctorate program in Graduated School of Mechanical Engineering, Pusan National University. He is researching on ignition delay characteristics of fuels.

Gyungmin Choi received his Ph.D. in Mechanical Engineering from Pusan National University in 1997 and from Osaka University in 2002. Dr. Choi is a Professor in School of Mechanical Engineering, Pusan National University, Busan, Korea. Dr. Choi is in charge of general affairs for the Korean Society of Combustion.

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Kang, K., Shim, T., Oh, C. et al. Effects of fuel composition and exhaust gas recirculation on ignition delay characteristics of n-heptane/hydrogen blended fuel. J Mech Sci Technol 31, 1509–1516 (2017). https://doi.org/10.1007/s12206-017-0250-x

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  • DOI: https://doi.org/10.1007/s12206-017-0250-x

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