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A Numerical Study on Stratified Charge Formation and Combustion Processes  

Lee, Suk-Young (Department of Mechanical Engineering, Pohang University of Science and Technology)
Huh, Kang-Y. (Department of Mechanical Engineering, Pohang University of Science and Technology)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.15, no.5, 2007 , pp. 86-96 More about this Journal
Abstract
A direct-injection stratified-charge(DISC) engine has been considered as a promising alternative in spite of high unburned hydrocarbon emission levels during light load operation. In this paper investigation is made to characterize formation and combustion processes of stratified mixture charge in a simple constant volume combustion chamber. Both experimental and numerical analyses are performed for fluid and combustion characteristics with 3 different induction types for rich, homogeneous and lean mixture conditions. The commercial code FIRE is applied to the turbulent combustion process in terms of measured and calculated pressure traces and calculated distributions of mean temperature, OH radical and reaction rate. It turns out that the highest combustion rate occurs for the rich state condition at the spark ignition location due to existence of stoichiometric mixture and timing.
Keywords
Constant volume combustion chamber; Stratified combustion; Turbulent combustion;
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