Journal Article
Effect of Pressure and Dilution on Flame Front Displacement in Boosted Spark-Ignition Engine Combustion
2008-06-23
2008-01-1625
The development of new types of engines (such as, the ‘downsizing’ engine) needs new characterizations and understandings of the combustion process inside the combustion chamber. Indeed, the usual turbulent premixed combustion models to represent as well as possible the combustion processes occurring in spark ignition (S.I) engine are based on the “flamelet” theory. But the operation mode for Boosting S.I engines are not usual for flame development: high pressure level and high dilution rate. Therefore, this paper investigates experimentally the local flame propagation of isooctane-air-diluents stoichiometric mixtures in a boosted S.I engine. The Mie scattering laser tomography technique is used to obtain the local flame front displacement in typical operating conditions of a ‘downsizing’ S.I. engine (i.e. high pressure level and high dilution rate).