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Numerical Comparison of Dynamic Stall for 2DAirfoils and an Airfoils Model in the DNW-TWG

Klein, Alexander and Richter, Kai and Gardner, Anthony Donald and Altmikus, A.R.M. and Lutz, Thorsten and Krämer, E (2011) Numerical Comparison of Dynamic Stall for 2DAirfoils and an Airfoils Model in the DNW-TWG. 37th European Rotorcraft Forum, 13. - 15. Sept. 2011, Milan, Italy.

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Official URL: http://www.erf2011.org/


The airfoil sections of helicopter rotors experience a wide range of flow conditions in forward flight from transonic flow on the advancing blade to subsonic flow and high angles of attack on the retreating blade. Most notably, the dynamic stall phenomenon has been a research topic for decades and various models have been introduced to predict the unsteady characteristics of the rotor blade undergoing unsteady separation. The objective of the present paper is to compare 2D dynamic stall computations, suitable for airfoil design studies considering unsteady characteristics, with wind tunnel environment CFD simulations taking into account three-dimensionality and wall effects. Differences between experiment and 2D computations can be partly attributed to side wall effects which alter the effective angle of attack at the mid-section pressure measurement plane. In order to gain more insight into these effects, investigations are presented which show the wind tunnel wall boundary layers and separation effects at the sidewall-airfoil junction.

Document Type:Conference or Workshop Item (Lecture, Paper)
Title:Numerical Comparison of Dynamic Stall for 2DAirfoils and an Airfoils Model in the DNW-TWG
AuthorsInstitution or Email of Authors
Klein, AlexanderIAG Stuttgart
Gardner, Anthony DonaldUNSPECIFIED
Altmikus, A.R.M.ECD
Lutz, ThorstenIAG Stuttgart
Krämer, EIAG Stuttgart
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 576-586
Series Name:Conference Proceedings on CD-ROM
Keywords:wall interference, CFD, Dynamic stall, Rotor, Helicopter, Blade, Aerodynamics, FLOWER
Event Title:37th European Rotorcraft Forum
Event Location:Milan, Italy
Event Type:international Conference
Event Dates:13. - 15. Sept. 2011
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: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Dr. Anthony Gardner
Deposited On:28 Sep 2011 10:57
Last Modified:28 Sep 2011 10:57

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