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NLF Potential of Laminar Transonic Long Range Aircraft

Thomas, Streit and Seitz, Arne and Hein, Stefan and Kunze, Philipp (2020) NLF Potential of Laminar Transonic Long Range Aircraft. AIAA Aviation 2020 Forum, 15-19. Juni 2020, USA VIRTUAL EVENT. doi: 10.2514/6.2020-2748.

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Official URL: https://arc.aiaa.org/doi/10.2514/6.2020-2748


In this work we present analysis and design results of NLF airfoils and wings for long range aircraft. Extension of wing laminar boundary layer for long range transonic aircraft design is limited by large Reynolds numbers and large wing leading edge sweeps. To explore the NLF potential different swept tapered 2.75D airfoils were designed using the CATNLF method. CATNLF allows attenuating the crossflow instability amplification in the nose region for wings with long range sweeps and Reynolds numbers. Crossflow instability is reduced to a level so that in the nose region NLF is achieved without requiring suction. For 3D studies the long range NASA NLF common research model CRM-NLF is used. Stability analysis and further design is performed using the CRM-NLF wing geometry. Linear stability results obtained with the eN method for the 2.75D and 3D cases show that that theextent of laminar flow for regions downstream of the nose is strongly dependent on the used stability analysis approach. It is shown that using either incompressible or compressible stability analysis together with the currently used assumptions for critical flight N-factor values leads to a significant different potential of laminar extent and wave drag reduction possibilities.

Item URL in elib:https://elib.dlr.de/135485/
Document Type:Conference or Workshop Item (Speech)
Title:NLF Potential of Laminar Transonic Long Range Aircraft
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Thomas, Streitth.streit (at) dlr.deUNSPECIFIED
Seitz, ArneArne.Seitz (at) dlr.deUNSPECIFIED
Hein, StefanStefan.Hein (at) dlr.deUNSPECIFIED
Kunze, PhilippPhilipp.Kunze (at) dlr.deUNSPECIFIED
Date:June 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.2514/6.2020-2748
Keywords:natural laminar flow (NLF), linear stability theory (LST), parabolized stability theory (PSE), inverse design, crossflow instability, transonic long range aircraft, RANS
Event Title:AIAA Aviation 2020 Forum
Event Type:international Conference
Event Dates:15-19. Juni 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
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Institute for Aerodynamics and Flow Technology > Helicopter, BS
Deposited By: Streit, Dr.rer.nat. Thomas
Deposited On:10 Jul 2020 11:53
Last Modified:10 Jul 2020 11:53

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