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Effects of Combustion Chamber Shape on the Stratified Combustion of a GDI Engine  

송재원 (고등기술연구원 기계/의용기술센터)
김미로 (고등기술연구원 기계/의용기술센터)
조한승 (고등기술연구원 기계/의용기술센터)
여진구 (고등기술연구원 기계/의용기술센터)
조남효 (고등기술연구원 기계/의용기술센터)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.10, no.1, 2002 , pp. 67-75 More about this Journal
Abstract
A study to investigate the influence of combustion chamber shape, especially piston top face configuration, on the combustion stability is presented with CFD analysis and single cylinder GDI engine test. Initial configuration of the piston bowl was designed with CFD analysis and further parametric studies of the design factors on the piston top face were carried out through the single cylinder GDI engine test. It was found that both the geometry of piston top face and the compression ratio have great influences on the combustion stability. Of interest is that the design factors of the GDI piston to prevent mixture diffusion out of the piston bowl have important roles for the stable combustion at the stratified mixture condition. Also the relationship between spray impingement and flow pattern in a GDI piston bowl should be considered to design an optimal bowl configuration for stable stratified combustion.
Keywords
GDI engine; Combustion chamber; Piston bowl; Combustion stability; Stratification;
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