Homogeneous Charge Compression Ignition (HCCI) offers benefits of high efficiency with low emissions, but suffers load range limitations and control issues. A method to improve control of HCCI was numerically investigated based on two separate fuel streams with different autoignition characteristics to regulate timing and heat release at specific operational conditions. In this numerical study n-heptane was selected as the primary fuel, and the secondary fuel was defined as a reformed product of n-heptane (RG). The reformed fuel species composition was experimentally determined based on steam/n-heptane reforming process at a steam/carbon mole ratio of 2:1. In addition to H2 and CO, the reformed fuel stream was composed of CH4, CO2, H2O and non-reformed n-heptane. A single zone model using a detailed chemical kinetic mechanism was implemented on CHEMKIN to study the effects of base fuel and steam-fuel reforming products on the ignition timing and heat release characteristics. The study was performed considering the reformed fuel species composition at total n-heptane conversion (stoichiometric) and also at the composition corresponding to a specific set of operational reforming temperatures. The computational model confirmed that the reformed products have a strong influence on the low temperature heat release (LTHR) region, affecting the onset of the high temperature heat release (HTHR). The ignition timing was proportionally delayed with respect to the baseline fuel case when higher concentrations of reformed gas were used.
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ASME 2009 Internal Combustion Engine Division Spring Technical Conference
May 3–6, 2009
Milwaukee, Wisconsin, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4340-6
PROCEEDINGS PAPER
Modeling the Effects of Steam-Fuel Reforming Products on Homogeneous Charge Compression Ignition of n-Heptane
Francisco Posada,
Francisco Posada
West Virginia University, Morgantown, WV
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Nigel N. Clark,
Nigel N. Clark
West Virginia University, Morgantown, WV
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Aleksandr Kozlov,
Aleksandr Kozlov
Gas Technology Institute, Des Plaines, IL
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Martin Linck,
Martin Linck
Gas Technology Institute, Des Plaines, IL
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Dmitri Boulanov,
Dmitri Boulanov
Gas Technology Institute, Des Plaines, IL
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John Pratapas
John Pratapas
Gas Technology Institute, Des Plaines, IL
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Francisco Posada
West Virginia University, Morgantown, WV
Nigel N. Clark
West Virginia University, Morgantown, WV
Aleksandr Kozlov
Gas Technology Institute, Des Plaines, IL
Martin Linck
Gas Technology Institute, Des Plaines, IL
Dmitri Boulanov
Gas Technology Institute, Des Plaines, IL
John Pratapas
Gas Technology Institute, Des Plaines, IL
Paper No:
ICES2009-76019, pp. 211-222; 12 pages
Published Online:
August 20, 2009
Citation
Posada, F, Clark, NN, Kozlov, A, Linck, M, Boulanov, D, & Pratapas, J. "Modeling the Effects of Steam-Fuel Reforming Products on Homogeneous Charge Compression Ignition of n-Heptane." Proceedings of the ASME 2009 Internal Combustion Engine Division Spring Technical Conference. ASME 2009 Internal Combustion Engine Division Spring Technical Conference. Milwaukee, Wisconsin, USA. May 3–6, 2009. pp. 211-222. ASME. https://doi.org/10.1115/ICES2009-76019
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