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Study of Transient In-Cylinder Air Motion Under Motoring Condition With Diesel Engine
Published October 21, 1997 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
The transient in-cylinder air motion have been investigated for reducing exhaust emissions and improving engine performance. A commercial CFD code was used for this purpose. For analyzing under engine motoring condition, the numerical model has a moving piston, intake and exhaust ports with moving valves.
As result, exhaust port performance may be analyzed under steady condition, but intake port performance have to be analyzed under unsteady condition. Because transient in-cylinder air motion during intake process is different from steady in-cylinder air motion under influence of piston surface and air viscosity.