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Study of Transient In-Cylinder Air Motion Under Motoring Condition With Diesel Engine
Technical Paper
978310
Sector:
Event:
JSAE Spring Conference
Language:
Japanese
Abstract
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.