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On the fluid-structure interaction of flexible membrane wings for MAVs in and out of ground-effect

On the fluid-structure interaction of flexible membrane wings for MAVs in and out of ground-effect
On the fluid-structure interaction of flexible membrane wings for MAVs in and out of ground-effect
Wind tunnel experiments are conducted at a Reynolds number of Re = 56,000, measuring rigid flat-plates and flexible membrane wings from free-flight into ground-effect conditions. Load cell measurements, digital image correlation and particle image velocimetry are applied in high-speed to resolve time-synchronised lift, drag and pitch oscillations simultaneously with membrane and flow dynamics. Proper orthogonal decomposition is applied on flow oscillations to determine their spatiotemporal evolution. Loads, membrane motions and flow dynamics are correlated to each other to investigate their underlying coupling physics. A membrane wing’s ability of static cambering and dynamic membrane oscillations are found to be beneficial when the wing is in ground-effect, where the descent in height forces premature leading-edge vortex-shedding and drag increase. The dynamic motions of membrane wings help to exploit vortex-shedding dynamics from the leading-edge that ensures time-averaged reattached flow over the wing upper surface, resulting in further lift enhancement. Membrane wings show lag-free fluid-membrane coupling at peak-lift conditions. In post-stall conditions, the membrane is found to lag the flow dynamics, signalling the end of direct fluid-structure coupling.
0889-9746
1-29
Bleischwitz, Robert
461358e1-6d90-4a9d-bc11-4a68595d4b7a
De Kat, Roeland
d46a99a4-8653-4698-9ef4-46dd0c77ba5d
Ganapathisubramani, Bharath
5e69099f-2f39-4fdd-8a85-3ac906827052
Bleischwitz, Robert
461358e1-6d90-4a9d-bc11-4a68595d4b7a
De Kat, Roeland
d46a99a4-8653-4698-9ef4-46dd0c77ba5d
Ganapathisubramani, Bharath
5e69099f-2f39-4fdd-8a85-3ac906827052

Bleischwitz, Robert, De Kat, Roeland and Ganapathisubramani, Bharath (2017) On the fluid-structure interaction of flexible membrane wings for MAVs in and out of ground-effect. Journal of Fluids and Structures, 1-29. (doi:10.1016/j.jfluidstructs.2016.12.001).

Record type: Article

Abstract

Wind tunnel experiments are conducted at a Reynolds number of Re = 56,000, measuring rigid flat-plates and flexible membrane wings from free-flight into ground-effect conditions. Load cell measurements, digital image correlation and particle image velocimetry are applied in high-speed to resolve time-synchronised lift, drag and pitch oscillations simultaneously with membrane and flow dynamics. Proper orthogonal decomposition is applied on flow oscillations to determine their spatiotemporal evolution. Loads, membrane motions and flow dynamics are correlated to each other to investigate their underlying coupling physics. A membrane wing’s ability of static cambering and dynamic membrane oscillations are found to be beneficial when the wing is in ground-effect, where the descent in height forces premature leading-edge vortex-shedding and drag increase. The dynamic motions of membrane wings help to exploit vortex-shedding dynamics from the leading-edge that ensures time-averaged reattached flow over the wing upper surface, resulting in further lift enhancement. Membrane wings show lag-free fluid-membrane coupling at peak-lift conditions. In post-stall conditions, the membrane is found to lag the flow dynamics, signalling the end of direct fluid-structure coupling.

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On the fluid-structure interaction of flexible membrane wings for MAVs in and out of ground-effect.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 2 December 2016
e-pub ahead of print date: 15 February 2017
Published date: April 2017
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 404049
URI: http://eprints.soton.ac.uk/id/eprint/404049
ISSN: 0889-9746
PURE UUID: bafe619a-d9ee-4da7-ab1a-c96453d09fc7
ORCID for Roeland De Kat: ORCID iD orcid.org/0000-0002-6851-4409
ORCID for Bharath Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

Catalogue record

Date deposited: 20 Dec 2016 09:53
Last modified: 14 May 2020 04:01

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