Abstract
The present study is a revisit to Ludwig Prandtl’s elimination of von Kármán vortex street behind a circular cylinder by using steady suction in the boundary layer. We show in particular the full-time vortex evolutions and vortex dynamics in the wake. The wind tunnel investigations are conducted at the Reynolds number (Re) of 2.0 × 104. Slot suction is implemented symmetrically on both lower and upper boundary layers of the cylindrical test model to modify the flow separation process and to eliminate the downstream vortex street. The boundary layer suction is described by the dimensionless momentum parameter of suction relative to the free-stream airflow. A high-speed particle image velocimetry system is employed in the present study to visualize the flow patterns and capture the wake dynamics of the natural and modified cylinders controlled with boundary-layer suction.
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Acknowledgements
This experimental work is funded by the National Natural Science Foundation of China (52008140, 51978222 and 51722805) and the Fundamental Research Funds for the Central Universities (HIT.BRETIV 201803 and 2020AUGA5710001020).
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Yang, W., Huang, Y., Gao, D. et al. Ludwig Prandtl’s envisage: elimination of von Kármán vortex street with boundary-layer suction. J Vis 24, 237–250 (2021). https://doi.org/10.1007/s12650-020-00708-0
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DOI: https://doi.org/10.1007/s12650-020-00708-0