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Wake-triggered secondary vortices over a cylinder/airfoil configuration

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Abstract

The wake/boundary–layer interactions over a cylinder/airfoil configuration are investigated using hydrogen bubble visualization and time-resolved particle image velocimetry. The chord Reynolds number of the NACA0012 airfoil is fixed at Rec = 6500. Both the wake-triggered double-secondary vortices topology reported over a multi-element airfoil configuration and the wake-triggered single-secondary vortex topology reported over a cylinder/flat-plate configuration are observed with the current configuration, as the vertical interval (yc/c) between the cylinder and the leading edge of the airfoil increases. The wake disturbances are found to penetrate the boundary layer above the airfoil with different patterns, leading to the change of wake-triggered topology. The wake-triggered secondary vortices effectively suppress the flow separation above the airfoil via a “momentum injection” mechanism, contributing to the enhancement of aerodynamic performance.

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Acknowledgements

The authors really appreciate the financial support of the National Natural Science Foundation of China and the China Postdoctoral Science Foundation. The authors also thank the anonymous reviewers whose comments and suggestions greatly improved the quality and clarity of the manuscript.

Funding

National Natural Science Foundation of China (11721202) and the China Postdoctoral Science Foundation (2021M700010 and 2022T150036).

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Authors and Affiliations

  1. Fluid Mechanics Key Laboratory of Education Ministry, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    Jiang-Sheng Wang, Jun Wu & Jin-Jun Wang

  2. National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang, 621999, China

    Jun Wu

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  1. Jiang-Sheng Wang
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Contributions

All authors contributed to the study conception and reviewed the manuscript. J-S W contributed to the data analysis, methodology, original draft writing and editing; J W conducted the experiments and advised on the data analysis; J-J W contributed to the supervision, methodology and editing.

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Correspondence to Jin-Jun Wang.

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Wang, JS., Wu, J. & Wang, JJ. Wake-triggered secondary vortices over a cylinder/airfoil configuration. Exp Fluids 64, 6 (2023). https://doi.org/10.1007/s00348-022-03546-y

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