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Unsteady Criteria for Rotor Blade Airfoil Design

Klein, Alexander and Richter, Kai and Altmikus, Andree and Lutz, Thorsten and Krämer, Ewald (2009) Unsteady Criteria for Rotor Blade Airfoil Design. 35th European Rotorcraft Forum, 22.-25. September 2009, Hamburg.

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The present paper deals with the definition and application of different unsteady criteria that may be considered in a dedicated aerodynamic design of rotorcraft airfoils. Today’s airfoil design methodologies for rotorcraft applications rely on steady computations and design criteria. Due to the inherent flow unsteadiness at forward flight, caused by variable incoming flow velocity, cyclic pitching as well as blade motion and deformation, it is however deemed necessary to further take into account unsteady aerodynamic effects and characteristics of the airfoil in the design process. Unsteady criteria are introduced for both 2D rotor-environment simulations with varying freestream Mach number and angle of attack and for high-frequency, small amplitude harmonic pitch oscillations at constant Mach number. By means of URANS simulations, with numerical settings validated against experiments, these criteria are exemplarily applied to the OA209 rotor blade airfoil geometry.

Item URL in elib:https://elib.dlr.de/59564/
Document Type:Conference or Workshop Item (Paper)
Title:Unsteady Criteria for Rotor Blade Airfoil Design
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Klein, AlexanderUniversität StuttgartUNSPECIFIED
Altmikus, AndreeEurocopter DeutschlandUNSPECIFIED
Lutz, ThorstenUniversität StuttgartUNSPECIFIED
Krämer, EwaldUniversität StuttgartUNSPECIFIED
Date:22 September 2009
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:2D unsteady airfoil characteristics, dynamic stall, URANS FLOWer, OA209, Liiva criterion
Event Title:35th European Rotorcraft Forum
Event Location:Hamburg
Event Type:Conference
Event Dates:22.-25. September 2009
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Richter, Kai
Deposited On:28 Jul 2009 09:30
Last Modified:19 Oct 2009 09:50

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