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Laminar-turbulent transition prediction for helicopter rotors in hover and forward flight – a RANS based investigation of transition mechanisms using empirical criteria

Heister, Christoph (2012) Laminar-turbulent transition prediction for helicopter rotors in hover and forward flight – a RANS based investigation of transition mechanisms using empirical criteria. European Rotorcraft Forum (ERF) 2012, 03.-07. Sept., Amsterdam, Niederlande.

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Abstract

The present paper deals with the laminar-turbulent transition prediction on helicopter rotors in hover and forward flight for RANS based rotor performance prediction. The investigation employs empirical criteria and covers transition mechanisms due to Tollmien-Schlichting and crossflow instabilities, laminar separation, bypass transition and attachment line contamination. An integral method and a family of chord- and spanwise velocity profiles are used for an approximate calculation of the laminar boundary layer quantities. The predicted transition positions are compared to the experimental data of a BO 105 in hover (DLR flight test) and of the 7AD rotor in forward flight (GOAHEAD wind tunnel test). The effect of the laminar flow on the predicted rotor performance is studied by comparison to fully turbulent results.

Document Type:Conference or Workshop Item (Paper)
Title:Laminar-turbulent transition prediction for helicopter rotors in hover and forward flight – a RANS based investigation of transition mechanisms using empirical criteria
Authors:
AuthorsInstitution or Email of Authors
Heister, Christophchristoph.heister@dlr.de
Date:3 September 2012
Refereed publication:No
In ISI Web of Science:No
Status:Published
Keywords:transition, laminar, turbulent, prediction, helicopter, rotor, empirical, RANS, hover, forward flight, crossflow, bypass, performance, boundary layer
Event Title:European Rotorcraft Forum (ERF) 2012
Event Location:Amsterdam, Niederlande
Event Type:international Conference
Event Dates:03.-07. Sept.
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:12 Sep 2012 15:09
Last Modified:12 Dec 2013 21:46

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