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Measurements of deformation, schlieren and forces on an OAT15A airfoil at buffet conditions

Accorinti, Alessandro and Baur, Tim and Scharnowski, Sven and Knebusch, Johannes and Dillinger, Johannes and Govers, Yves and Nitzsche, Jens and Kähler, C. (2020) Measurements of deformation, schlieren and forces on an OAT15A airfoil at buffet conditions. In: IOP Conference Series: Materials Science and Engineering. 10th EASN Virtual International Conference, 02.-04. Sep. 2020, Online. doi: 10.1088/issn.1757-899X. ISSN 1757-899X. (In Press)

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Abstract

Self-sustained shock wave oscillations on airfoils, commonly defined as shock buffet, can occur under certain combinations of transonic Mach number and angle of attack due to the interaction between the shock and the separated boundary layer. To help understanding buffet physics, a rigid supercritical wing model (OAT15A) was investigated in pre-buffet and buffet conditions using a combined application of BOS (Background Oriented Schlieren), deformation and force measurements. From the observation via BOS of the change of the shock location and the extent of the boundary layer separation with the AoA (angle of attack), the transition from stable shock to buffet was detected. A comparison with other research groups at supposedly similar aerodynamic conditions highlighted a great disparity among them in terms of buffet onset, amplitudes of buffet oscillations, and flow development (motion of the mean shock location with the AoA) after the onset. The average and rms (root mean square) of the surface displacement were computed together with the effective geometric AoA, taking into account the static torsional deformation of the model and its support. Moreover, the spectra of the balance and deformation data showed the same buffet peak as in the BOS spectrum, indicating a coupling between structure and flow, which increased with the AoA.

Item URL in elib:https://elib.dlr.de/139915/
Document Type:Conference or Workshop Item (Speech)
Title:Measurements of deformation, schlieren and forces on an OAT15A airfoil at buffet conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Accorinti, AlessandroUniversität der Bundeswehr MünchenUNSPECIFIED
Baur, TimUniversität der Bundeswehr MünchenUNSPECIFIED
Scharnowski, SvenUniversität der Bundeswehr, MünchenUNSPECIFIED
Knebusch, JohannesJohannes.Knebusch (at) dlr.dehttps://orcid.org/0000-0001-9180-9638
Dillinger, JohannesJohannes.Dillinger (at) dlr.dehttps://orcid.org/0000-0002-7522-7555
Govers, YvesYves.Govers (at) dlr.dehttps://orcid.org/0000-0003-2236-596X
Nitzsche, JensJens.Nitzsche (at) dlr.dehttps://orcid.org/0000-0002-2742-7368
Kähler, C.Universität der Bundeswehr MünchenUNSPECIFIED
Date:2020
Journal or Publication Title:IOP Conference Series: Materials Science and Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1088/issn.1757-899X
ISSN:1757-899X
Status:In Press
Keywords:flutter, buffeting, unsteady aerodynamics, shock buffet, fluid structure interaction, transonic flow
Event Title:10th EASN Virtual International Conference
Event Location:Online
Event Type:international Conference
Event Dates:02.-04. Sep. 2020
Organizer:FCH JU
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 - Simulation and Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Institute of Aeroelasticity > Aeroelastic Simulation
Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Knebusch, Johannes
Deposited On:23 Dec 2020 12:20
Last Modified:23 Dec 2020 12:20

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