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Enhancing tip vortices to improve the lift production through shear layers in flapping-wing flow control

Published online by Cambridge University Press:  12 November 2024

Bruce Ruishu Jin Open the ORCID record for Bruce Ruishu Jin [Opens in a new window] ,
Li Wang Open the ORCID record for Li Wang [Opens in a new window] ,
Sridhar Ravi Open the ORCID record for Sridhar Ravi [Opens in a new window] ,
John Young Open the ORCID record for John Young [Opens in a new window] ,
Joseph C.S. Lai Open the ORCID record for Joseph C.S. Lai [Opens in a new window]  and
Fang-Bao Tian Open the ORCID record for Fang-Bao Tian [Opens in a new window]
Bruce Ruishu Jin
Affiliation:
School of Engineering and Technology, University of New South Wales, Canberra, ACT 2600, Australia
Li Wang
Affiliation:
School of Engineering and Technology, University of New South Wales, Canberra, ACT 2600, Australia
Sridhar Ravi
Affiliation:
School of Engineering and Technology, University of New South Wales, Canberra, ACT 2600, Australia
John Young
Affiliation:
School of Engineering and Technology, University of New South Wales, Canberra, ACT 2600, Australia
Joseph C.S. Lai
Affiliation:
School of Engineering and Technology, University of New South Wales, Canberra, ACT 2600, Australia
Fang-Bao Tian*
Affiliation:
School of Engineering and Technology, University of New South Wales, Canberra, ACT 2600, Australia
*
†Email address for correspondence: [email protected]
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Abstract

Flow control of a low-aspect-ratio flat-plate heaving wing at an average angle of attack of $10^{\circ }$ by a steady-blowing jet is numerically studied by using a feedback immersed boundary–lattice Boltzmann method. Blowing jets at the leading edge, mid-chord and trailing edge are considered. The wing enjoys the highest lift production with the trailing-edge downstream blowing jet, which improves the average lift by 50.0 % at $Re = 1000$ and 22.9 % at $Re = 5000$ through the enhancement of the tip vortex circulation caused by the increase in the mass flux of the shear layer at the wing tips. This increase in mass flux decreases as $Re$ increases from 1000 to 5000 due to its self-limiting mechanism. A mid-chord vertical blowing jet induces a middle vortex which enhances the lift production but the enhancement is smaller than that of trailing-edge downstream blowing jet. Other jet arrangements do not significantly increase the lift coefficient, but the mid-chord upstream blowing jet experiences a significant reduction in the drag coefficient, leading to an increase of 50.6 % in the average lift-to-drag ratio. The effectiveness of the flow control is not significantly affected by the aspect ratio.

JFM classification

Biological Fluid Dynamics: Swimming/flying
Type
JFM Papers
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Journal of Fluid Mechanics , Volume 999 , 25 November 2024 , A25
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© The Author(s), 2024. Published by Cambridge University Press

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