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Slat cove dynamics of multi-element airfoil at low Reynolds number

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Abstract

The flow around the slat cove of a two-dimensional 30P30N multi-element airfoil is investigated with time-resolved particle image velocimetry (TR-PIV) at low Reynolds number (Rec = 2.41 × 104 and 4.61 × 104). The effects of angle of attack (α = 8°, 12°, and 16°) on the mean flow characteristics and vortex dynamics are discussed. The size of the recirculation within the slat cove and the intensity of the shed vortices originating from the slat cusp shear layer are found to generally decrease as the angle of attack increases. The joint time-frequency analyses show that disturbances of different frequencies exist in the slat cusp shear layer and they trigger the different vortex shedding patterns of the slat cusp shear layer. The self-sustained oscillation within the slat cove, normally observed at high Reynolds number (Rec ~ 106), is proved to be responsible for the disturbances of different frequencies and the related vortex dynamics in the current study.

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Authors and Affiliations

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

    JiangSheng Wang, Yang Xu & JinJun Wang

Authors
  1. JiangSheng Wang
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  2. Yang Xu
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  3. JinJun Wang
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Corresponding author

Correspondence to JinJun Wang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 12102024 and 11721202) and the China Postdoctoral Science Foundation (Grant Nos. 2021M700010 and 2022T150036).

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Wang, J., Xu, Y. & Wang, J. Slat cove dynamics of multi-element airfoil at low Reynolds number. Sci. China Technol. Sci. 66, 1166–1179 (2023). https://doi.org/10.1007/s11431-022-2308-7

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  • DOI: https://doi.org/10.1007/s11431-022-2308-7

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