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Experimental investigation of air jets to control shock-induced dynamic stall

Gardner, Anthony Donald and Richter, Kai and Mai, Holger and Neuhaus, Dietmar (2013) Experimental investigation of air jets to control shock-induced dynamic stall. AHS 69th Annual Forum and Technology Display "Advancing Vertical Flight Technology in Demanding Environments", 21. - 23. Mai 2013, Phoenix, Arizona, USA.

Full text not available from this repository.

Official URL: http://www.as.go.dlr.de/HK/pmwiki/uploads/AHS2013/isv7/default2.htm

Abstract

This paper shows experimental results for dynamic stall control on a dynamically pitching OA209 airfoil at Mach 0.5, with Re=1.9×106 and Re=0.85×106. The control was by supersonic constant blowing on the suction side of the airfoil. Dry compressed air was blown normal to the airfoil chord, from portholes at 10% chord, with diameter 1% chord. Jet spacing along the airfoil breadth was varied from 6.7% chord to 20% chord. At both Reynolds numbers, the OA209 experienced shock-induced stall with a hysteresis in lift and pitching moment around the static values, rather than the overshoot in forces typically associated with a dynamic stall vortex. The forces and the stall control were primarily functions of the maximum angle of attack, with full control of stall possible for maximum angles of attack of 14° and less. For deep dynamic stall with maximum angles of attack 18°, the jet spacing and blowing pressure was varied. A good optimum was found for the jets spaced at 20% chord and Cq=0.004 (Cm =0.016) resulting in a reduction of the pitching moment peak by 60%.

Item URL in elib:https://elib.dlr.de/78104/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Experimental investigation of air jets to control shock-induced dynamic stall
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gardner, Anthony DonaldUNSPECIFIEDUNSPECIFIED
Richter, KaiUNSPECIFIEDUNSPECIFIED
Mai, HolgerUNSPECIFIEDUNSPECIFIED
Neuhaus, DietmarUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-12
Series Name:Conference Proceedings digital
Status:Published
Keywords:Dynamic Stall, Rotor blade, OA209, Flow control, air jets, DNW-TWG
Event Title:AHS 69th Annual Forum and Technology Display "Advancing Vertical Flight Technology in Demanding Environments"
Event Location:Phoenix, Arizona, USA
Event Type:international Conference
Event Dates:21. - 23. Mai 2013
HGF - Research field:Aeronautics, Space and Transport
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: Köln-Porz , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Materials Physics in Space
Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Gardner, Dr.habil. Anthony
Deposited On:29 May 2013 09:44
Last Modified:29 May 2013 16:00

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