Etude de la combustion de gaz de synthèse issus d'un processus de ...

Conclusions
tel-00623090, version 1 - 13 Sep 2011
coefficients, dependent of engine characteristics, on the turbulent burning velocity and
heat transfer models. A number of turbulent burning velocity models are available, such
as Blizard and Keck, (1974); Tabaczynski et al. (1980); Gülder (1990); Matthews and
Chin, (1991); Bradley et al., (1992); Zimont, (2000); Peters, (2000). These models
could be applied in the code in order to verify each one best reproduce the turbulence
of syngas-air flames. Several correlations for calculating the heat transfer coefficient in
SI engines have been published in the literature. These correlations provide a heat
transfer coefficient representing a spatially-averaged value for the cylinder. Hence, they
are commonly referred to as global heat transfer models, e.g. Annand (1963), Woschni
(1967), Hohenberg (1979) and Chiodi and Bargende, (2001). The developed multizone
model has shown to predict the in-cylinder pressure with very good accuracy.
Additional simulations can then be run to evaluate the potential of supercharging the
engine, which allow increasing the power and maybe the use of even poor syngas
compositions like the fluidized bed composition. Improvements could be made adding a
pollutants formation model including out of equilibrium reactions. An additional model to
specific fuel consumption could be developed as this parameter is one of the most
important to determine the viability of stationary power production systems IC engine
based.
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