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.
Andreassi L., C.S. (2003). A modified combustion model to simulate CNG heavy duty fuelled by using KIVA 3 code. In American Society of Mechanical Engineers, Internal Combustion Engine Division (Publication) ICE (pp.227-233).
|Autori:||Andreassi L., Cordiner S., Mulone V., Rocco V.|
|Titolo:||A modified combustion model to simulate CNG heavy duty fuelled by using KIVA 3 code|
|Nome del convegno:||Proceedings of the 2003 Spring Technical Conference of the ASME Internal Combustion Engine Division|
|Luogo del convegno:||Salzburg|
|Anno del convegno:||11 May 2003 through 14 May 2003|
|Enti collegati al convegno:||The Internal Combustion Engine Division,ASME|
|Data di pubblicazione:||2003|
|Settore Scientifico Disciplinare:||Settore ING-IND/08 - Macchine a Fluido|
|Tipologia:||Intervento a convegno|
|Citazione:||Andreassi L., C.S. (2003). A modified combustion model to simulate CNG heavy duty fuelled by using KIVA 3 code. In American Society of Mechanical Engineers, Internal Combustion Engine Division (Publication) ICE (pp.227-233).|
|Appare nelle tipologie:||02 - Intervento a convegno|