Quantitative interpretation of complex unsteady flows via high-image-density particle image velocimetry

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Abstract
Representative classes of unsteady separated flows are interpreted using high-image-density particle image velocimetry,l which allows determination of the instantaneous, sectional streamline patterns and distributions of vorticity. Comparison of these instantaneous realizations in two orthogonal planes reveals fundamental mechanisms of distortion of the vorticity concentrations. Furthermore, by acquiring successive images closely spaced in time, it is possible to construct 3D volume representations of iso-vorticity. These quantitative approaches reveal limitations of interpreting patterns of instantaneous and ensemble-averaged flow structure.

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