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:

Authors	Institution 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:

UNSPECIFIED

HGF - Program:

UNSPECIFIED

HGF - Program Themes:

UNSPECIFIED

DLR - Research area:

UNSPECIFIED

DLR - Program:

UNSPECIFIED

DLR - Research theme (Project):

["eprint_fieldopt_dlr_project_search_L000" not defined]

Location:

Braunschweig

Institutes and Institutions:

Institute of Aerodynamics and Flow Technology > Helicopters

Deposited By:

Christoph Heister

Deposited On:

28 Sep 2011 16:21

Last Modified:

06 Dec 2012 15:56

Available Versions of this Item

Semi/empirical Transition Prediction and Application to an Isolated Rotor in Hover. (deposited 28 Sep 2011 16:21) [Currently Displayed]
- Semi/empirical Transition Prediction and Application to an Isolated Rotor in Hover. (deposited 06 Dec 2012 15:56)

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