Mechanical Engineering - Research Publications

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    Inclined cross-stream stereo PIV measurements in turbulent boundary layers.
    Hutchins, N. ; Hambleton, W. ; Marusic, I. (CIMNE, 2004)
    By arranging the laser light-sheet and image plane of a stereo PIV system ininclined spanwise/wall-normal planes (inclined at both 45± and 135± to the x-axis) we have obtained a unique quantitative view of the turbulent boundarylayer in planes aligned both with and against the principle vorticity axis of aproposed hairpin model. These experiments have been repeated across a range ofReynolds numbers (Re¿ ¼ 800 ¡ 3050). In-plane swirl results indicate the presenceof inclined eddies, arranged about low-speed regions (with circumstantialevidence suggesting that these occasionally group into packet-like formations).Two-point correlations show that outer scaling is the correct way to quantifythe characteristic spanwise lengthscale across the range of Re¿ .