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Towards the Investigation of Unsteady Control Surface Aerodynamics

Geisbauer, Sven (2015) Towards the Investigation of Unsteady Control Surface Aerodynamics. DLR Symposium "High-Lift System Research - Celebrating 10 Years of DLR-F15", 7.-9. Dezember 2015, Braunschweig, Deutschland.

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Fostering the application range of CFD methods towards the simulation of entire flight manoeuvres still is a challenging task. It needs to be ensured that the aerodynamic effects evolving from the deflection of a control surface are properly resolved and that their impact on the overall aerodynamics is accurately predicted. Focussing on control surfaces CFD methods have traditionally been applied to investigate the performance of high-lift systems during take-off and landing. In recent years the interest in applying CFD to questions arising from other control surfaces gradually increased. The performance of a vertical tail with deflected rudder in engine-out conditions, for instance, or the efficiency of ailerons and spoilers are nowadays often determined using CFD. All these applications, however, have in common that they address static control surface deflections only. To close the gap towards manoeuvre flight simulations it is therefore indispensable to take the dynamic motion of a control surface and their transient aerodynamic behaviour into account. Spoilers, for example, are well known to exhibit a strongly nonlinear aerodynamic behaviour with significant time lags. Depending on their deflection rate spoilers may even yield a short-term lift augmentation. The investigation of spoiler aerodynamics is therefore hardly possible with low-fidelity tools. A profound assessment of the transient aerodynamic behaviour of a dynamic spoiler therefore requires an experimental data base with which the higher-fidelity CFD simulations can be validated. As DLR was lacking a wind tunnel model offering these functionalities it was decided to modify the DLR-F15 model with a dynamic control surface. The present paper highlights the constraints for the development of this new version of the DLR-F15 model and gives an overview on the background and the objective of the work planned.

Item URL in elib:https://elib.dlr.de/102170/
Document Type:Conference or Workshop Item (Speech)
Title:Towards the Investigation of Unsteady Control Surface Aerodynamics
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:CFD, TAU, spoiler, speed brake, control surface, aerodynamics, F15, wind tunnel, validation
Event Title:DLR Symposium "High-Lift System Research - Celebrating 10 Years of DLR-F15"
Event Location:Braunschweig, Deutschland
Event Type:Other
Event Dates:7.-9. Dezember 2015
Organizer:DLR Institut für Aerodynamik und Strömungstechnik
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 - Military Technologies (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Geisbauer, Sven
Deposited On:25 Jan 2016 14:26
Last Modified:01 Jan 2020 03:00

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