Effects of integral length scale variations on the stall characteristics of a wing at high free-stream turbulence conditions
Effects of integral length scale variations on the stall characteristics of a wing at high free-stream turbulence conditions
The effect of variations in the integral length scale of incoming free-stream turbulence on a NACA0012 wing is investigated with the use of force, moment and particle image velocimetry measurements. At a chord-based Reynolds number (where c is the chord length, is the free-stream velocity and is the kinematic viscosity) of, an active grid generates turbulence intensities of 15 % at normalised integral length scales ranging from 0.5 to 1. The introduction of turbulence improves the time-averaged performance characteristics of the wing by delaying stall and increasing the peak lift coefficient. It is found that for half-chord integral length scales, the magnitude of the fluctuations in forces and moments is larger than that of full-chord integral length scales, as the former amplifies the naturally occurring unsteadiness in the flow (when there is no free-stream turbulence). The increase in magnitude is ascribed to a larger density of smaller-scale vortices within the separated flow and wake region of the wing.
separated flows
Thompson, C.
f6a694f9-2c34-4baf-bd66-d8152432c277
Biler, H.
70228dd8-d797-4d5d-82c0-48b5b67eb55a
Symon, S.
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Ganapathisubramani, B.
5e69099f-2f39-4fdd-8a85-3ac906827052
25 October 2023
Thompson, C.
f6a694f9-2c34-4baf-bd66-d8152432c277
Biler, H.
70228dd8-d797-4d5d-82c0-48b5b67eb55a
Symon, S.
2e1580c3-ba27-46e8-9736-531099f3d850
Ganapathisubramani, B.
5e69099f-2f39-4fdd-8a85-3ac906827052
Thompson, C., Biler, H., Symon, S. and Ganapathisubramani, B.
(2023)
Effects of integral length scale variations on the stall characteristics of a wing at high free-stream turbulence conditions.
Journal of Fluid Mechanics, 974, [A9].
(doi:10.1017/jfm.2023.789).
Abstract
The effect of variations in the integral length scale of incoming free-stream turbulence on a NACA0012 wing is investigated with the use of force, moment and particle image velocimetry measurements. At a chord-based Reynolds number (where c is the chord length, is the free-stream velocity and is the kinematic viscosity) of, an active grid generates turbulence intensities of 15 % at normalised integral length scales ranging from 0.5 to 1. The introduction of turbulence improves the time-averaged performance characteristics of the wing by delaying stall and increasing the peak lift coefficient. It is found that for half-chord integral length scales, the magnitude of the fluctuations in forces and moments is larger than that of full-chord integral length scales, as the former amplifies the naturally occurring unsteadiness in the flow (when there is no free-stream turbulence). The increase in magnitude is ascribed to a larger density of smaller-scale vortices within the separated flow and wake region of the wing.
Text
effects-of-integral-length-scale-variations-on-the-stall-characteristics-of-a-wing-at-high-free-stream-turbulence-conditions
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Accepted/In Press date: 17 September 2023
Published date: 25 October 2023
Additional Information:
Funding Information:
We gratefully acknowledge funding from EPSRC (grant ref. EP/V05614X/1) and the School of Engineering at the University of Southampton for C.T.'s PhD studentship.
Keywords:
separated flows
Identifiers
Local EPrints ID: 485585
URI: http://eprints.soton.ac.uk/id/eprint/485585
ISSN: 0022-1120
PURE UUID: 8b170e24-3751-436c-be47-0dee490a3a88
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Date deposited: 11 Dec 2023 17:47
Last modified: 18 Mar 2024 03:16
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Author:
C. Thompson
Author:
H. Biler
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