The existence of the cyclic variation of
the flow inside a cylinder affects the performance of the engine.
Developing methods to understand and control incylinder flow has been a goal of
engine designers for nearly one hundred years. Passive control of the intake flow
of a 3.5-liter Daimler Chrysler engine was examined using a unique optical
diagnostic technique: Molecular Tagging Velocimetry (MTV), which has been
developed at the Michigan State University ARES. Probability density functions (PDF's)
of the normalized circulation are calculated from instantaneous planar velocity
measurements to quantify gas motion within a cylinder. The emphasis of this
work is the 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.
For additional information see The
Measurement and Control of Cyclic Variations of Flow in a Piston Cylinder
Assembly, under Recent Publications Section.
