Proceedings Of The Romanian Academy, Series A, Volume 14, Number 2/2013,
pp. 161–168
Comparison Of Combustion Characteristics And Heat Loss For Gasoline And Methane Fueling Of A Spark
Ignition Engine
Adrian Irimescu
iamotors@yahoo.com
“Politehnica” University of Timişoara,
Faculty of Mechanical Engineering, Bld. Mihai Viteazul 1, 300222 Timişoara
Abstract
Improved extraction methods have led to
increased natural gas production figures, making this fuel a more and more
attractive alternative to gasoline. Other advantages such as increased octane
rating and reduced carbon dioxide emissions due to lower carbon content also
make methane a good candidate for use in spark ignition (SI) engines. An
experimental study was performed on a premixed charge SI engine in order to
evaluate the differences between gasoline and methane fueling.
Based on pressure trace measurements, combustion
characteristics and heat losses were analyzed for different engine speed as
well as torque settings. Both fuels were found to feature similar combustion
duration and cumulative heat loss values. Heat loss distribution during
combustion was comparable for the two fuels, with an increase of radiant heat
transfer for the gaseous energy source. Methane fueling consistently featured
higher indicated fuel conversion efficiency, mainly due to the possibility of
spark advance optimization. This resulted in higher pressure levels throughout
combustion and improved work output. Also, air–fuel ratios could be shifted
closer to stoichiometric compared to gasoline that required slightly richer
mixtures to achieve the same level of stability in operation.
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