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Validation of Boundary-Layer-Transition Computations for a Rotor with Axial Inflow

Kaufmann, Kurt and Ströer, Philip and Richez, Francois and Lienard, Caroline and Gardarein, Patrick and Krimmelbein, Normann and Gardner, Anthony D. (2019) Validation of Boundary-Layer-Transition Computations for a Rotor with Axial Inflow. In: Proceedings of the 75th Annual Forum and Technology Display, pp. 1-16. Forum 75, 75th Annual Forum and Technology Display, 13 .16. Mai 2019, Philadelphia, PA, USA.

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Official URL: https://vtol.org/

Abstract

Boundary-layer-transition computations are performed using the in-house finite-volume solvers elsA by ONERA and TAU by DLR. Reynolds-averaged Navier-Stokes simulations, using the Langtry-Menter model as well as semiempirical transition criteria, are presented using both solvers for a rotor in climb. The numerical results are compared to temperature-sensitive paint experiments conducted at DLR's rotor test facility. Concerning the Langtry-Menter computation, transition occurs with both solvers due to laminar separation close to the trailing edge, further downstream than seen in the experiment. Semi-empirical transition criteria predict transition within both codes due to laminar separation, which was not detected in the experiments. When only considering the AHD criterion, the transition locations within the numerical simulations and the experiment are in good agreement along the entire span in all three considered test cases. In addition, numerical results are presented for a test case with cyclic pitch. These unsteady boundary-layer transition computations are carried out using the semi-empirical transition criteria approach of DLR-TAU. In accordance with the static test cases, the results are promising, as long as the laminar-separation criterion is deactivated.

Item URL in elib:https://elib.dlr.de/122554/
Document Type:Conference or Workshop Item (Speech)
Title:Validation of Boundary-Layer-Transition Computations for a Rotor with Axial Inflow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kaufmann, KurtKurt.Kaufmann (at) dlr.dehttps://orcid.org/0000-0003-2276-3386
Ströer, PhilipPhilip.Stroeer (at) dlr.deUNSPECIFIED
Richez, FrancoisONERA - The French Aerospace Lab, F-92190, Meudon, FranceUNSPECIFIED
Lienard, CarolineONERAUNSPECIFIED
Gardarein, PatrickONERAUNSPECIFIED
Krimmelbein, Normannnormann.krimmelbein (at) dlr.deUNSPECIFIED
Gardner, Anthony D.anthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Date:May 2019
Journal or Publication Title:Proceedings of the 75th Annual Forum and Technology Display
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-16
Series Name:Conference Proceedings digital
Status:Published
Keywords:Helicopter, Rotor, CFD, Experiment, Boundary Layer Transition
Event Title:Forum 75, 75th Annual Forum and Technology Display
Event Location:Philadelphia, PA, USA
Event Type:international Conference
Event Dates:13 .16. Mai 2019
Organizer:AHS - The Vertical Flight Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Institute for Aerodynamics and Flow Technology > CASE, GO
Institute for Aerodynamics and Flow Technology > CASE, BS
Deposited By: Winkels, Elisabeth
Deposited On:12 Jun 2019 11:32
Last Modified:19 Sep 2019 13:30

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