Prethodno priopćenje
Modelling of the physicochemical phenomena in an experiment similar to a gasoline engine
Elhoussin Affad
; Faculty of Technology and Science, Mohammedia, MORROCO
M. Assou
; University of Liege, Laboratory of Thermodynamics, Liege, BELGIUM
Sažetak
Combustion is a very complex field, since it simultaneously involves several disciplines such as heat transfer, chemistry, turbulence, mass transport etc. In this paper we tried to model a combustion chamber with a geometry close to that of the spark ignition engine. The initial and boundary conditions are well-known. The modeling is based on the approach of calculated probability density function (pdf) in case of turbulent combustion. We used a transport equation for the probability density function similar to the modeling case of the physical and chemical species. Indeed, the theoretical study of this pdf is well developed but its applications remain very limited. In the present paper, the pdf is coupled with a simplified chemistry. This model of combustion was introduced into the KIVA II code in order to simulate the combustion process in a rectangular combustion chamber which is very similar to that of the spark ignition engine (SI). The results found by this model of combustion are compared with the experiment at different operating conditions such as the propane/air equivalence ratio, temperature and pressure. The final results and the conclusions are satisfactory. In this paper, we present only the results relating to a given
operation condition with a study of the sensitivity of the flame radius on the equivalence ratio. We believe that the results could be implemented on the case of the spark ignition engine.
Ključne riječi
turbulent combustion, chemistry, probability density function
Hrčak ID:
316190
URI
Datum izdavanja:
22.12.2003.
Posjeta: 8 *