Abstract
A stereoscopic-PIV system was developed to operate with the light sheet oriented perpendicular to the main flow direction, which makes it possible to measure the streamwise vorticity. The SPIV system is based on an angular displacement of 45 degrees of the two cameras and a 3D calibration based reconstruction method. It was expected that the large out of plane motion would limit the accuracy of the measurements, which was therefore investigated in detail for laminar and turbulent pipe flow. The laminar flow measurements revealed the importance of a precise alignment of the light sheet with respect to the calibration plane. Small misalignments lead to unacceptably large so called registration errors. Although the registration error was described by several authors before, it has never been properly quantified . We explain and predict the amount of registration error and check this with direct measurements. After alignment, the laminar velocity profile and turbulence statistics were reproduced with very high accuracy, which proves the applicability of SPIV to flows with large out of plane motion. At the end of the paper an example is presented of the application of the SPIV system to the study of transition in pipe flow.
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van Doorne, C.W.H., Westerweel, J., Nieuwstadt, F.T.M. (2004). Measurement Uncertainty of Stereoscopic-PIV for Flow with Large Out-of-plane Motion. In: Stanislas, M., Westerweel, J., Kompenhans, J. (eds) Particle Image Velocimetry: Recent Improvements. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18795-7_15
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DOI: https://doi.org/10.1007/978-3-642-18795-7_15
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