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Experimental control of compressible OA209 dynamic stall by air jets

Gardner, Anthony Donald and Richter, Kai and Neuhaus, Dietmar and Mai, Holger (2012) Experimental control of compressible OA209 dynamic stall by air jets. European Rotorcraft Forum 2012, 04. - 06. Sept. 2012, Amsterdam, The Netherlands.

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Official URL: http://erf2012.nlr.nl/index.html

Abstract

The experimental investigation of constant blowing air jets as Fluidic Control Devices (FCDs) for helicopter dynamic stall control is described. A carbon fibre airfoil of constant OA209 cross-section was fitted with a pneumatic system to deliver dry compressed air as jets for flow control at total pressures of up to 10 bar. The experiment used porthole jets of radius 1% chord, positioned at 10% chord and with spacing 6.7% chord. The positive dynamic stall control effects were demonstrated at Mach 0.3, 0.4 and 0.5 for deep dynamic stall test cases with the best test cases reducing the pitching moment peak after the main stall by 84%, while increasing the mean lift over one pitching cycle by 37%. The conclusions from the experiments are supported by 3D URANS computations of the pitching airfoil with flow control using the DLR-TAU code.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Experimental control of compressible OA209 dynamic stall by air jets
Authors:
AuthorsInstitution or Email of Authors
Gardner, Anthony DonaldUNSPECIFIED
Richter, KaiUNSPECIFIED
Neuhaus, DietmarUNSPECIFIED
Mai, HolgerUNSPECIFIED
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-16
Series Name:Conference Proceedings on USB-Stick
Status:Published
Keywords:Dynamic stall, TWG, jets, FCD, OA209, SIMCOS, TAU
Event Title:European Rotorcraft Forum 2012
Event Location:Amsterdam, The Netherlands
Event Type:international Conference
Event Dates:04. - 06. Sept. 2012
Organizer:Netherlands Association of Aeronautical Engineers (NVvL)
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: 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: Dr. Anthony Gardner
Deposited On:11 Sep 2012 12:32
Last Modified:12 Sep 2012 14:27

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