Effects of an Oscillating Flap on the Main Airfoil Unsteady Lift in Grid Turbulence

Herricos Stapountzis; Athanasios Barlas; Georgios Papageorgiou; Athanasios Patsiouras

doi:10.1007/978-3-030-55594-8_41

Effects of an Oscillating Flap on the Main Airfoil Unsteady Lift in Grid Turbulence

Herricos Stapountzis^*, Athanasios Barlas, Georgios Papageorgiou, Athanasios Patsiouras

^*Corresponding author for this work

University of Thessaly

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

Abstract

A wing of NACA 0015 profile and Aspect Ratio 2.4 fitted with a Trailing Edge Flap was tested in a wind tunnel for both smooth and turbulent flow conditions at a Re number 108000. The unsteady lift on the wing was measured with and without the flap. Two types of flap excitation were tried: One was of the “open loop” type in which the flap was subjected to sinusoidal pitching oscillations while the wing was set to a constant angle of attack. In the second, “closed loop” mode, the excitation signal fed into the flap originated from the unsteady lift of the wing itself. The phase lag between those signals was changed and it was found that it played a significant role in the suppression of the main wing unsteady lift.

Original language	English
Title of host publication	Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications
Editors	Marianna Braza , Kerry Hourigan , Michael Triantafyllou
Number of pages	11
Publisher	Springer
Publication date	2021
Pages	493-503
ISBN (Print)	978-3-030-55593-1
ISBN (Electronic)	978-3-030-55594-8
DOIs	https://doi.org/10.1007/978-3-030-55594-8_41
Publication status	Published - 2021
Event	IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications - Satorini, Greece Duration: 18 Jun 2018 → 22 Jun 2018

Conference

Conference	IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications
Country/Territory	Greece
City	Satorini
Period	18/06/2018 → 22/06/2018

Series	Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Volume	147
ISSN	1612-2909

Keywords

Trailing edge flap
Wind turbine load alleviation
Smart blades
Unsteady aerodynamics
Active flow control

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10.1007/978-3-030-55594-8_41

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Stapountzis, Herricos ; Barlas, Athanasios ; Papageorgiou, Georgios et al. / Effects of an Oscillating Flap on the Main Airfoil Unsteady Lift in Grid Turbulence. Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications. editor / Marianna Braza ; Kerry Hourigan ; Michael Triantafyllou. Springer, 2021. pp. 493-503 (Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Vol. 147).

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title = "Effects of an Oscillating Flap on the Main Airfoil Unsteady Lift in Grid Turbulence",

abstract = "A wing of NACA 0015 profile and Aspect Ratio 2.4 fitted with a Trailing Edge Flap was tested in a wind tunnel for both smooth and turbulent flow conditions at a Re number 108000. The unsteady lift on the wing was measured with and without the flap. Two types of flap excitation were tried: One was of the “open loop” type in which the flap was subjected to sinusoidal pitching oscillations while the wing was set to a constant angle of attack. In the second, “closed loop” mode, the excitation signal fed into the flap originated from the unsteady lift of the wing itself. The phase lag between those signals was changed and it was found that it played a significant role in the suppression of the main wing unsteady lift.",

keywords = "Trailing edge flap, Wind turbine load alleviation, Smart blades, Unsteady aerodynamics, Active flow control",

author = "Herricos Stapountzis and Athanasios Barlas and Georgios Papageorgiou and Athanasios Patsiouras",

year = "2021",

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booktitle = "Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications",

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Stapountzis, H, Barlas, A, Papageorgiou, G & Patsiouras, A 2021, Effects of an Oscillating Flap on the Main Airfoil Unsteady Lift in Grid Turbulence. in MB, KH & MT (eds), Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications. Springer, Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol. 147, pp. 493-503, IUTAM Symposium on Critical Flow Dynamics involving Moving/Deformable Structures with Design applications, Satorini, Greece, 18/06/2018. https://doi.org/10.1007/978-3-030-55594-8_41

Effects of an Oscillating Flap on the Main Airfoil Unsteady Lift in Grid Turbulence. / Stapountzis, Herricos; Barlas, Athanasios; Papageorgiou, Georgios et al.
Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications. ed. / Marianna Braza; Kerry Hourigan; Michael Triantafyllou. Springer, 2021. p. 493-503 (Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Vol. 147).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

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AU - Patsiouras, Athanasios

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KW - Unsteady aerodynamics

KW - Active flow control

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Stapountzis H, Barlas A, Papageorgiou G, Patsiouras A. Effects of an Oscillating Flap on the Main Airfoil Unsteady Lift in Grid Turbulence. In MB, KH, MT, editors, Advances in Critical Flow Dynamics Involving Moving/Deformable Structures with Design Applications. Springer. 2021. p. 493-503. (Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Vol. 147). doi: 10.1007/978-3-030-55594-8_41

Effects of an Oscillating Flap on the Main Airfoil Unsteady Lift in Grid Turbulence

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