Quantitative fluid velocity measurements by automatic analysis of flow visualization images

The purpose of this work is to characterize the in-cylinder tumbling flow generated by an engine head during the induction process using flow visualization and particle tracking velocimetry (PTV). The study was carried out for a 4-valve engine head with shrouded intake valves in a special single cylinder transient water analog. This shrouded intake valve configuration was used to obtain a prototypical "pure tumble" flow suitable for fundamental combustion studies. The results revealed that the shrouded intake valves generate a strong, well-behaved tumble vortex on the axial plane between the cylinder head and the piston face. This vortex dominates the entire flow field and seems to be highly repeatable from cycle to cycle. The effect of engine speed on this tumbling flow was studied. An equivalent "tumble ratio" was defined and evaluated using the measured velocity fields at BDC (bottom dead center).

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Directional ambiguity resolution in particle image velocimetry by pulse tagging

Grant

Liu

1990

Experiments in Fluids

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Quantitative fluid velocity measurements by automatic analysis of flow visualization images

Cited by 11 publications

References 5 publications

Quantitative Flow Visualization of Three-Dimensional Flows

Quantitative Flow Visualization of Three-Dimensional Flows

Study of the intake tumble motion by flow visualization and particle tracking velocimetry

Directional ambiguity resolution in particle image velocimetry by pulse tagging

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