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Influence of surface irregularities on the expected boundary-layer transition location on hybrid laminar flow control wings

Franco, Juan and Theiß, Alexander and Hein, Stefan (2020) Influence of surface irregularities on the expected boundary-layer transition location on hybrid laminar flow control wings. In: 22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII - Jahresbericht 2020, pp. 56-57. Springer Nature. 22. STAB/DGLR Symposium 2020, 15. Juli 2020, Göttingen, Deutschland.

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Official URL: https://www.dlr.de/as/de/Portaldata/5/Resources/dokumente/veranstaltungen/stab_workshop/STAB-Jahresbericht-2020.pdf

Abstract

Hybrid laminar flow control (HLFC) wings have captured the interest of several research projects, in particular the HLFC-WIN project [1], because of the potential of suction for reducing drag on commercial aircraft [2]. This reduction in drag is mainly due to the impact on laminarturbulent transition, extending the region along the wings where the flow remains laminar. Typically, on HLFC wings, suction is applied only in the leading edge region (before the front spar). The flow suction modifies the boundary-layer (BL) profiles in such a way that the growth of flow instabilities that might trigger the above mentioned laminar-turbulent transition location, e.g. Tollmien-Schlichting (TS) waves or crossflow (CF) vortices, is delayed. However, the joint between the leading edge suction panel and the wing box may introduce surface irregularities (e.g. backward/forward-facing steps (BFS/FFS), gaps, etc.) that might enhance the spatial development of those flow instabilities and, therefore, reduce the potential benefit of the suction system [3]. For this reason, it is crucial during the design process to quantify the influence of such surface irregularities in terms of BL instability.

Item URL in elib:https://elib.dlr.de/139891/
Document Type:Conference or Workshop Item (Other)
Additional Information:STAB-Jahresbericht 2020
Title:Influence of surface irregularities on the expected boundary-layer transition location on hybrid laminar flow control wings
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Franco, JuanJuan.Franco (at) dlr.dehttps://orcid.org/0000-0002-8391-8356
Theiß, AlexanderAlexander.Theiss (at) dlr.dehttps://orcid.org/0000-0003-4034-3246
Hein, StefanStefan.Hein (at) dlr.deUNSPECIFIED
Date:October 2020
Journal or Publication Title:22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII - Jahresbericht 2020
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 56-57
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Status:Published
Keywords:Surface irregularity, laminar-turbulent transition, AHLNS, PSE, HLFC wing
Event Title:22. STAB/DGLR Symposium 2020
Event Location:Göttingen, Deutschland
Event Type:national Conference
Event Dates:15. Juli 2020
Organizer:STAB/DGLR
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 for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Franco, Juan
Deposited On:22 Dec 2020 10:57
Last Modified:22 Dec 2020 10:57

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