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Stall Delay and Leading-Edge Suction for a Pitching Airfoil with Trailing-Edge Flap

He, Guosheng and Deparday, Julien and Siegel, Lars and Henning, Arne and Mulleners, Karen (2020) Stall Delay and Leading-Edge Suction for a Pitching Airfoil with Trailing-Edge Flap. AIAA Journal, xx, pp. 1-10. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J059719. ISSN 0001-1452.

Full text not available from this repository.

Official URL: https://doi.org/10.2514/1.J059719

Abstract

The flow around a pitching NACA0015 airfoil with an oscillating trailing-edge flap is experimentally investigated to characterize the influence of the flap kinematics on the development of dynamic stall. We specifically focus on the timing of the stall development and critical values of the leading-edge suction parameter as potential stall triggers. In general, static or dynamic trailing-edge flap motions strongly affect the entire lift response but preserve the characteristic evolution of the leading-edge suction parameter. The influence of the flap on the critical values of the leading-edge suction parameter and their timing is more subtle. Variations in the magnitude of the leading-edge suction are related to the instantaneous geometric effective angle of attack. A thin-airfoil theory-based model that linearly superimposes the effect of the flap on the response for a fixed flap in its neutral position correctly predicts the maximum values of the leading-edge suction parameter. The timing at which these maxima are reached corresponds to the stall delay and is dominated by the prestall temporal evolution of the effective angle of attack. Our results suggest that dynamic stall development is governed by characteristic stall delays rather than critical values of the maximum leading-edge suction parameter.

Item URL in elib:https://elib.dlr.de/136212/
Document Type:Article
Title:Stall Delay and Leading-Edge Suction for a Pitching Airfoil with Trailing-Edge Flap
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
He, Guoshengguosheng.he (at) epfl.chUNSPECIFIED
Deparday, Julienjulien.deparday (at) epfl.chUNSPECIFIED
Siegel, LarsLars.Siegel (at) dlr.deUNSPECIFIED
Henning, Arnearne.henning (at) dlr.dehttps://orcid.org/0000-0002-2806-8213
Mulleners, Karenkaren.mulleners (at) epfl.chUNSPECIFIED
Date:11 September 2020
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:xx
DOI :10.2514/1.J059719
Page Range:pp. 1-10
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDAIAAUNSPECIFIED
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:dynamic stall, pitching airfoil, trailing-edge flap, particle image velocimetry, pressure measurements
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Siegel, Lars
Deposited On:13 Oct 2020 11:43
Last Modified:05 Nov 2020 13:20

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