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2003-01-1357 |
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Title: The measurement and control
of cyclic variations of flow in a piston cylinder assembly |
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Abstract: |
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The existence of the cyclic variation of the flow
inside an cylinder affects the performance of the engine. Developing
methods to understand and control in-cylinder flow has been a goal of
engine designers for nearly 100 years. In this paper, passive control of
the intake flow of a 3.5-liter DaimlerChrysler engine was examined using a
unique optical diagnostic technique: Molecular Tagging Velocimetry (MTV),
which has been developed at Michigan State University. Probability density
functions (PDFs) of the normalized circulation are calculated from
instantaneous planar velocity measurements to quantify gas motion within a
cylinder. Emphasis of this work is examination of methods that quantify
the cyclic variability of the flow. In addition, the turbulent kinetic
energy (TKE) of the flow on the tumble and swirl plane is calculated and
compared to the PDF circulation results. |
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Index Terms: |
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Combustion;
Cylinders;
Engine
tests; Swirl
flow; Tumble
flow; Velocimetry;
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Author(s): |
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Other Info: |
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Publisher: Society of
Automotive Engineers, Inc., Warrendale, Pennsylvania, USA |
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Meeting Name: SAE
2003 World Congress |
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