The use of CNG as a fuel for SI engines represents a feasible solution to improve engine fuel economy (so reducing also CO2 emissions) and to face with short term urban pollution. To full exploit its potential is, however, necessary to tailor engine characteristics to this gaseous fuel in order to optimize its performances. Numerical simulation of these engines plays an important role in the design procedure, but specific problems related to CNG combustion have to be solved. In the present paper this task is performed by means of a modified version of KIVA-3 with respect to the combustion model formulation. The modified combustion model formulation is based on flamelet hypothesis, and constitutes an extension of the classical BML concept. Its formulation avoids any explicit dependence on turbulent time (different from the traditional approach based on “characteristic times”), by modeling length scales on the basis of laminar flames properties. The numerical results have been compared with the experimental ones carried out at the CNR Istituto Motori of Naples under different engine loads, engine speeds and air/fuel mixture conditions. The results obtained are really encouraging, even under lean conditions when the interaction between turbulent flow field and the involved combustion phenomena becomes more complex.
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ASME 2003 Internal Combustion Engine Division Spring Technical Conference
May 11–14, 2003
Salzburg, Austria
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
0-7918-3678-9
PROCEEDINGS PAPER
A Modified Combustion Model to Simulate CNG Heavy Duty Fuelled by Using KIVA 3 Code Available to Purchase
Luca Andreassi,
Luca Andreassi
University of Roma “Tor Vergata”, Roma, Italy
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Stefano Cordiner,
Stefano Cordiner
University of Roma “Tor Vergata”, Roma, Italy
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Vincenzo Mulone,
Vincenzo Mulone
University of Roma “Tor Vergata”, Roma, Italy
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Vittorio Rocco
Vittorio Rocco
University of Roma “Tor Vergata”, Roma, Italy
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Luca Andreassi
University of Roma “Tor Vergata”, Roma, Italy
Stefano Cordiner
University of Roma “Tor Vergata”, Roma, Italy
Vincenzo Mulone
University of Roma “Tor Vergata”, Roma, Italy
Vittorio Rocco
University of Roma “Tor Vergata”, Roma, Italy
Paper No:
ICES2003-0664, pp. 227-233; 7 pages
Published Online:
February 4, 2009
Citation
Andreassi, L, Cordiner, S, Mulone, V, & Rocco, V. "A Modified Combustion Model to Simulate CNG Heavy Duty Fuelled by Using KIVA 3 Code." Proceedings of the ASME 2003 Internal Combustion Engine Division Spring Technical Conference. Design, Application, Performance and Emissions of Modern Internal Combustion Engine Systems and Components. Salzburg, Austria. May 11–14, 2003. pp. 227-233. ASME. https://doi.org/10.1115/ICES2003-0664
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