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Large-scale structures forming in a cross flow : particle image velocimetry conditional analysis

Camussi R., Stella A., Guj G., Kowalewski T. A.

Machine Graphics and Vision

1999

Vol. 8, No. 4

579-595

A conditional Particle Image Velocimetry (PIV) acquisition technique and averaging procedure are developed to study coherent structures formed by the interaction between a jet and a cross-stream. The experiment is constructed in a water tunnel, the water transversal jet is perturbed by a mechanical device. Measurements are performed at reynolds number 100 and cross-flow velocity ratio ranging from 2.0 to 4.5. Sequences of images are acquired synchronously to the perturbation so that a statistical process may be applied to obtain average velocity and vorticity in a selected cross-section of the flow. The averaged fields and the instantaneous images together with flow visualizations by Laser Induced Fluorescence (LIF) technoque are used to interpret behaviour of the large-scale vortices generated in the cross-flow experiment.