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Modeling of In-Cylinder Flow and Mixing Processes in a Stratified-Charge Spark Ignition Engine
Published December 03, 1996 by Institution of Mechanical Engineers in United Kingdom
Event: Lean Burn Combustion Engines
This paper reports results from a study on in-cylinder mixing between two gases using computational fluid dynamics modeling. The commercial code, CFDS-FLOW3D, was used to model the in-cylinder flow and mixing of a stratified-charge spark-ignitio engine. Two cases were considered. The first case involved two concentric swirling flows comprising air and fuel mixture in the center and diluent gas in the peripheral region. The second case involved three parallel tumble flows comprising the air and fuel mixture sandwiched between two diluent streams. The effects of swirl and tumble flows on mixing were investigated. The results for mixing patterns at different crank angles during the compression stroke are reported. The implications of the results to the stratified-charge engine design are discussed.