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Experimental investigation of dynamic stall performance for the EDI-M109 and EDI-M112 airfoils

Gardner, Anthony Donald and Richter, Kai and Mai, Holger and Altmikus, A.R.M. and Klein, A and Rohart, C.-H. (2011) Experimental investigation of dynamic stall performance for the EDI-M109 and EDI-M112 airfoils. 37th European Rotorcraft Forum , 13.-15. Sept. 2011, Gallarate, Varese, Italy.

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An experimental investigation of the dynamic performance of two new rotor blade airfoils was undertaken in a transonic wind tunnel. The EDI-M109 and EDI-M112 airfoils were tested at 0.3<M<0.5 for pitching motions with amplitude 0.5° to 8° and frequencies 3.3Hz<f<45Hz. The results show that both new airfoils have acceptable dynamic stall performance, and the effect of frequency, amplitude, and higher order pitching motion on these results is described. The pitching moment peak size was found to have an approximately linear correlation to the normalised mean angular velocity, and thus test cases with the same maximum angle of attack and oscillation frequency had similar dynamic stall qualities. The correlation between low aerodynamic damping for high frequency, low amplitude pitching motion and poor dynamic stall performance is shown to be low. The dynamic stall response of the EDI-M112 airfoil is shown to be better for M=0.3 and M=0.4, and the response of the EDI-M109 airfoil is better at M=0.5. The dynamic performance of the airfoils is compared to the OA209.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Experimental investigation of dynamic stall performance for the EDI-M109 and EDI-M112 airfoils
AuthorsInstitution or Email of Authors
Gardner, Anthony DonaldUNSPECIFIED
Altmikus, A.R.M.ECG
Klein, AIAG, Uni. Stuttgart
Refereed publication:No
In ISI Web of Science:No
Keywords:helicopter rotor airfoils, DNW-TWG, dynamic stall, unsteady airfoil analysis, Airfoil design
Event Title:37th European Rotorcraft Forum
Event Location:Gallarate, Varese, 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
Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Dr. Anthony Gardner
Deposited On:21 Nov 2011 11:43
Last Modified:29 Nov 2011 15:16

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