|
2000-01-2799 |
||||||||||
|
Title: A comparison of modeled and
measured 3-D in-cylinder charge motion throughout the displacement of a
four-valve SI engine |
||||||||||
|
||||||||||
|
Abstract: |
||||||||||
|
The flow inside a combustion engine is highly complex
and varies significantly with small changes in the engine configuration.
For a long time IC-engine researches have tried to predict the major mean
flow patterns inside close-to-production engine setups. During the last
decades computational fluid dynamics (CFD) has significantly contributed
to the engine development process. Hence, significant research has
focussed on the comparison of modeled and measured flows in IC engines.
However, according to the knowledge of the authors, this study is the
first fully three-dimensional (3-D), modeling and measurement effort has
evaluated the vast majority of the displacement volume by using an
identical engine geometry. With improved, non-intrusive, 3-D velocity
measurement technology, the vast majority of the cylinder displacement was
explored and compared with Star-CD modeling results at the same locations.
The majority of the ensemble-averaged, 3-D velocity data exhibited similar
flow patterns and tumble numbers within the center of the cylinder.
Significant flow differences were observed in the outer regions, close to
the cylinder walls, as well as in the level and shape of the turbulence
during the intake stroke. The flow differences found in this study confirm
the need for developments in computational and experimental methods. |
||||||||||
|
|
||||||||||
|
Index Terms: |
||||||||||
|
Engine
design; Measurement; Swirl
flow; Three
dimensional analysis; Tumble
flow; Velocimetry;
|
||||||||||
|
Author(s): |
||||||||||
|
||||||||||
|
Other Info: |
||||||||||
|
Publisher: Society of
Automotive Engineers, Inc., Warrendale, Pennsylvania, USA |
||||||||||
|
Meeting Name: SAE
International Fall Fuels and Lubricants Meeting and Exhibition |
||||||||||