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Semi/empirical Transition Prediction and Application to an Isolated Rotor in Hover

Heister, C.C. (2011) Semi/empirical Transition Prediction and Application to an Isolated Rotor in Hover. 46th Symposium of Applied Aerodynamics, 28.-30. März 2011, Orleans, Frankreich.

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Abstract

The transition prediction capability of two semi/empirical methods originating from fixed wing applications is studied for steady, rotary wing application. This includes the AHD criterion, and two variants of the Michel criterion. Both criteria are used with approximated boundary layer data, aiming to reduce dependency on near wall grid quality. The prediction methods have been implemented in the DLR’s structured flow solver FLOWer. A two-dimensional airfoil test case (Somers NLF(1)-0416) is used to study prediction accuracy, comparing three different turbulence models. A three-dimensional rotor test case at hover (DLR Bo 105 flight test) serves to validate the criteria’s computed transition locations. The influence of the criteria’s distinct laminar run-ning lengths on the rotor’s performance is shown by a relative comparison of figure of merit.

Document Type:Conference or Workshop Item (Paper)
Title:Semi/empirical Transition Prediction and Application to an Isolated Rotor in Hover
Authors:
AuthorsInstitution or Email of Authors
Heister, C.C.christoph.heister@dlr.de
Date:March 2011
Status:Published
Keywords:transition, prediction, empirical, AHD, Michel, boundary layer, approximation, CFD, FLOWer, helicopter, rotor, hover, performance flight test
Event Title:46th Symposium of Applied Aerodynamics
Event Location:Orleans, Frankreich
Event Type:international Conference
Event Dates:28.-30. März 2011
Organizer:3AF
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
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Christoph Heister
Deposited On:06 Dec 2012 15:56
Last Modified:12 Dec 2013 21:54

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