Abstract
In this study, we describe a multi-camera large field-of-view (FOV) planar-PIV experiment to capture the wide range of scales that coexist in high Reynolds number turbulent boundary layers. The proposed measurements are designed to capture spatial flow features over a greater range than current common practices, and at significantly lower cost. With this goal in mind, specialist PIV cameras are substituted with modern consumer full-frame digital cameras, which are typically available at a fraction of the cost, with higher resolution sensors. These cameras are configured to capture single-frame double-exposed images (DE-PIV), but at a much higher spatial resolution than what is available from specialist PIV cameras that capture double-frame single-exposure images (SE-PIV). This work discusses a set of simulations and experiments to quantitatively assess the quality of the PIV velocity fields from these two approaches for large field-of-view measurements. Our findings confirm that despite the known loss-of-accuracy associated with DE-PIV, the use of high-resolution cost-effective consumer cameras provides an economically feasible PIV solution with the necessary performance and accuracy for high spatial range measurements in wall-bounded turbulent flows.
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Acknowledgements
The authors wish to gratefully thank the financial support of the Australian Research Council. C M would like to thank the financial support from the Early Career Researcher Grants Scheme (The University of Melbourne).
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de Silva, C.M., Grayson, K., Scharnowski, S. et al. Towards fully-resolved PIV measurements in high Reynolds number turbulent boundary layers with DSLR cameras. J Vis 21, 369–379 (2018). https://doi.org/10.1007/s12650-017-0465-z
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DOI: https://doi.org/10.1007/s12650-017-0465-z