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Influence of flexibility on the steady aeroelastic behavior of a swept wing in transonic flow

Schewe, Günter and Mai, Holger (2018) Influence of flexibility on the steady aeroelastic behavior of a swept wing in transonic flow. Journal of Fluids and Structures, 81, pp. 255-269. Elsevier. DOI: 10.1016/j.jfluidstructs.2018.04.021 ISSN 0889-9746

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Abstract

The development in the last decades generally shows that large aircraft wings have become more light and flexible, thus the investigation of the effects of elasticity is suggested. If for example the flexible wing is also backward swept, then the situation becomes even more complex — the kinematic coupling between bending and torsion leads to a structural washout effect. In order to investigate the influence of flexibility, in the project ‘‘Aerostabil’’ an aeroelastically scaled half-model was tested compared to its rigid equivalent. The flexible model was equipped with pressure transducers in three wing sections and accelerometers, while the rigid model had a reduced number of sensors. The experiments were performed in the adaptive test section of a transonic wind tunnel. Steady and unsteady pressure-, and force measurements were conducted for fixed and oscillating wings. Already Dietz et al. (2003) have reported about the special features of the wing models, their structural properties and preliminary results. The present paper is focused on the analysis of the global Forces and pressure distributions for the range 0.5 ≤ Ma ≤ 0.88. The angle of attack was varied from −4◦ to 4◦ and also the quasistatic aeroelastic derivatives for lift and moment were obtained. When the model is rigid in the transonic regime and at moderate angles of incidence the pressure Distribution exhibits a single shock system, in contrast for the flexible wing there is a double shock system. For the flexible wing up to about Ma = 0.82 the curves of global lift, moment and their derivatives are rather smooth and are remaining on nearly the same level. Beyond there are moderate deviations up to the end of the transonic regime. However examining the corresponding curves of the rigid wing the changes are drastic,particularly in the transonic range. Obviously the structural wash-out, particularly of the outer wing leads to an attenuation of the transonic effects.

Item URL in elib:https://elib.dlr.de/121129/
Document Type:Article
Title:Influence of flexibility on the steady aeroelastic behavior of a swept wing in transonic flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schewe, Günterguenter.schewe (at) dlr.deUNSPECIFIED
Mai, HolgerHolger.Mai (at) dlr.deUNSPECIFIED
Date:August 2018
Journal or Publication Title:Journal of Fluids and Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:81
DOI :10.1016/j.jfluidstructs.2018.04.021
Page Range:pp. 255-269
Publisher:Elsevier
ISSN:0889-9746
Status:Published
Keywords:transonic flow; swept wing; influence of flexibility; Aerostabil wing; structural washout effect
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Mai, Holger
Deposited On:16 Aug 2018 08:46
Last Modified:09 Jul 2019 08:51

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