Reduce pollutant emission in the combustion chamber of spark ignited engines, improve the operation of catalyst exhaust systems and optimize the complete system for low pollution emission and high energy efficiency. Work is focused on transient phases, cold starting phases and part load operation, which are the main pollution causes of spark-ignition engines.
Six European car manufacturers (members of the Joint Research Committee) collaborate in this project on spark-ignition engines.
Considering the large contribution of transient phases, cold starting phases, or part load conditions to the energy consumption and pollution formation in a combustion engine driven vehicle, it is important to focus on the development of an engine which can cope with diluted charge conditions like: high air/fuel ratio, large amount of residual gases, and a high level of exhaust gas recirculation.
Two key topics will therefore be investigated:
flame behaviour in its first growing steps and their effect on subsequent development,
sensitivity to unburnt hydrocarbon formation.
Work in this project will include:
Development of an experimental methodology which addresses mainly Laser visualisation and measurement techniques in engines, by planar imaging of mixture preparation and pollutant formation, and by spot imaging with optical fibers of unburnt hydrocarbons near the walls.
Knowledge and data base acquisition which deals with:
the fuel and burnt gases distribution before ignition and during the flame front development.
the flow dynamics and local composition effects on flame initiation and early propagation.
the NO characterization behind the flame front.
the unburnt hydrocarbons (UHC) sources, oil film contribution to UHC and measurements in the combustion chamber and in the exhaust.
Associated computational fluid dynamics code development. Here the SPEED code set up in a previous project (EN3E-0124-CD) will be used, for modelling of combustion in spark-ignited engine. Further development of the SPEED code for this purpose will be carried out in collaboration with the IDEA project (JOUE-CT89-0008) on Diesel engine improvement. The basic fluid dynamics and numerical method of this code are being developed within the IDEA project, while specific aspects dealing with homogeneous combustion will be developed within this project.
Funding SchemeCSC - Cost-sharing contracts
405 08 Göteborg
221 00 Lund
CV35 0BL Warwick