Gaseous fuels, such as Liquefied Petroleum Gas (LPG) and Natural Gas (NG), thank to their good mixing capabilities, allow complete and cleaner combustion than normal gasoline, resulting in lower pollutant emissions and particulate matter. Moreover natural gas, which is mainly constituted by methane, whose molecule has the highest hydrogen/carbon ratio, leads also to lower ozone depleting emissions. The authors in a previous work (1) experienced the simultaneous combustion of gasoline and natural gas in a bi-fuel S.I. engine, exploiting so the high knock resistance of methane to run the engine with an ‘overall stoichiometric’ mixture (thus lowering fuel consumption and emissions) and better spark advance (which increases engine efficiency) even at full load: the results showed high improvements in engine efficiency without noticeable power losses with respect to the pure gasoline operation. With the aim to provide a knock prevision submodel to be used in engine thermodynamic simulations for a knock-safe performance optimization of engines fuelled by NG/gasoline mixtures, the authors recorded the in-cylinder pressure cycles under light knocking condition for different engine speed, loads and natural gas fraction (i.e. the ratio between the injected natural gas mass and the total fuel mass), and used the gas pressure data to calibrate a classical knock-prediction model: as shown, the results obtained allow to predict the onset of knocking in a S.I. engine fuelled with a gasoline-natural gas mixture with any proportion between the two fuels, with a maximum error of 5 CAD.
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ASME 2009 Internal Combustion Engine Division Fall Technical Conference
September 27–30, 2009
Lucerne, Switzerland
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4363-5
PROCEEDINGS PAPER
Calibration of a Knock Prediction Model for the Combustion of Gasoline-Natural Gas Mixtures Available to Purchase
Emiliano Pipitone,
Emiliano Pipitone
University of Palermo, Palermo, Italy
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Stefano Beccari
Stefano Beccari
University of Palermo, Palermo, Italy
Search for other works by this author on:
Emiliano Pipitone
University of Palermo, Palermo, Italy
Stefano Beccari
University of Palermo, Palermo, Italy
Paper No:
ICEF2009-14057, pp. 191-197; 7 pages
Published Online:
July 8, 2010
Citation
Pipitone, E, & Beccari, S. "Calibration of a Knock Prediction Model for the Combustion of Gasoline-Natural Gas Mixtures." Proceedings of the ASME 2009 Internal Combustion Engine Division Fall Technical Conference. ASME 2009 Internal Combustion Engine Division Fall Technical Conference. Lucerne, Switzerland. September 27–30, 2009. pp. 191-197. ASME. https://doi.org/10.1115/ICEF2009-14057
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