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Unsteady High-Lift Aerodynamics – Unsteady RANS Validation An Overview on the UHURA Project

Wild, Jochen (2020) Unsteady High-Lift Aerodynamics – Unsteady RANS Validation An Overview on the UHURA Project. 10th EASN International Conference, 2020-09-02 - 2020-09-04, virtuell.

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Official URL: https://easnconference.eu/2020/home


Laminar wing technology is seen as the major single source for drag reduction on the airframe of a transport aircraft and will be a key technology to achieve the targets for emission reduction. In recent EC funded projects, the Krueger flap leading edge device was found to be the most promising concept of a dual-functional leading-edge device for laminar wings. While the these studies focused on the general performance and integration, the behavior of the system during its deployment or retraction proves to be a major issue due to the very different kind of motion compared to conventional leading edge high-lift devices. The risks of this concept are identified in the areas of load estimates, handling qualities and asymmetric failure cases. During the deployment, the Krueger device is deflected from the lower side against the flow, passing critical stations when perpendicular to the flow, forming large scale separated flow on the lower side when moved around the leading edge (Figure 1). Current conservative estimations require the installation of many independently driven Krueger flap elements to prevent examination of critical situations along the whole wing span. The multiplication of drive stations leads to increasing complexity, weight and maintenance costs. On the other hand, despite the great progress in numerical simulation methods in the past years, there have up to now been no investigations on the validity of the current methods for predicting the behavior regarding these critical topics. The aerodynamics during movement of high-lift devices have not yet been addressed in detail. The project UHURA is focusing on the unsteady flow behavior around high-lift systems and will first time deliver a deeper understanding of critical flow features at new types of high-lift devices of transport aircraft during their deployment and retraction together with a validated numerical procedure for its simulation. UHURA performs detailed experimental measurements in several wind tunnels to obtain a unique data set for validation purposes of Computational Fluid Dynamics (CFD) software, including detailed flow measurements by Particle Image Velocimetry (PIV) and other optical measurement technologies. Advanced CFD methods promising significant improvements in the design lead time are validated against this database to obtain efficient and reliable prediction methods for design.

Item URL in elib:https://elib.dlr.de/137145/
Document Type:Conference or Workshop Item (Speech)
Title:Unsteady High-Lift Aerodynamics – Unsteady RANS Validation An Overview on the UHURA Project
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wild, JochenUNSPECIFIEDhttps://orcid.org/0000-0002-2303-3214UNSPECIFIED
Date:2 September 2020
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Aerodynamics, Laminar Flow, High-Lift, Krueger flap, Unsteady Aerodynamics, CFD, Validation, Wind-Tunnel experiment
Event Title:10th EASN International Conference
Event Location:virtuell
Event Type:international Conference
Event Start Date:2 September 2020
Event End Date:4 September 2020
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 (old)
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Institute for Aerodynamics and Flow Technology > CASE, BS
Technical Infrastructure > Systemhaus Technik
Deposited By: Wild, Dr.-Ing. Jochen
Deposited On:09 Nov 2020 12:37
Last Modified:24 Apr 2024 20:39

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