Overview
The spark ignition engine, operating at stoichiometry, has undeniable advantages in terms of emissions of local pollutants, noise or driving ability. Nevertheless, faced by the new environmental challenges, improving efficiency and CO2 emissions from these engines is indispensable. Technologically, solutions such as strong "downsizing" of engines, gasoline direct injection (FDI) and combustion by auto-ignition (CAI Controlled Auto Ignition) have certain strengths, with performance gains expected 15 to 25%.
The primary objective of the project proposed by the Scientific Group Motors (GSM), in collaboration with the CNRS aims to provide the elements of understanding and tools to the development of these technologies on an industrial scale. His approach involves the development of experimental methodologies and investigative tools for detailed analysis and understanding of phenomena. These tools are then used to evaluate and optimize the approaches (strong downsizing, direct petrol injection, CAI combustion CNG / H2). In parallel, this approach also aims to develop modelling tools to capitalize on the results achieved in the computer codes used by manufacturers to the development of their engines.
The proposed programme will seek to overcome the remaining scientific obstacles, identify the most promising technology routes and identify design rules to accelerate the placing on the market of those engines. The first part is dedicated to technologies for improving the efficiency of spark ignition engines: strong downsizing, IDE and CAI.
Funding
Results
A number of experimental tools combining different optical diagnoses and measurement techniques have been set up and can now be exploited to improve our understanding of the phenomena involved in new technologies designed for AC engine combustion.
Advanced descriptions of non-premixed turbulent combustion have been introduced for engine calculations under these conditions. The efforts to extend this type of modelling in the event that premix and non-premixed flame coexist are expected to continue.
In addition, the modelling of liquid film formation / oxidation requires future development based on the lessons learned from the experimental phases of project.