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Influence of oscillation amplitude and Mach number on the unsteady transition on a pitching rotor blade airfoil

Richter, Kai and Koch, Stefan and Gardner, Anthony Donald (2013) Influence of oscillation amplitude and Mach number on the unsteady transition on a pitching rotor blade airfoil. AHS 69th Annual Forum and Technology Display "Advancing Vertical Flight Technology in Demanding Environments", 21. - 23. May 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

The unsteady flow around the pitching helicopter main rotor blade airfoil EDI-M109 was experimentally investigated at conditions similar to those existing on a retreating rotor blade in forward flight. High speed pressure measurements and hot film anemometry were used to investigate the unsteady transition characteristics of the airfoil. Results are presented for dynamic test points with attached flow, light dynamic stall and deep dynamic stall at M = 0.3 - 0.5 and Re/M = 6x10e6. The transition process of the pitching airfoil is analyzed and the influences of the oscillation amplitude, the mean and the minimum angles of attack are discussed for the time-dependent transition characteristics and the transition hysteresis. The effect of the Mach number on the flow field and on the unsteady transition behavior is presented and a significant change in the transition characteristics is revealed at high Mach number.

Item URL in elib:https://elib.dlr.de/78118/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of oscillation amplitude and Mach number on the unsteady transition on a pitching rotor blade airfoil
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Richter, KaiUNSPECIFIEDUNSPECIFIED
Koch, StefanUNSPECIFIEDUNSPECIFIED
Gardner, Anthony DonaldUNSPECIFIEDUNSPECIFIED
Date:21 May 2013
Refereed publication:No
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-13
Series Name:Conference Proceedings digital
Status:Published
Keywords:helicopter rotor blade airfoil, EDI-M109, dynamic stall, unsteady boundary layer transition, hot film anemometry, intermittency, laminar, turbulent
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. May 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: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Richter, Kai
Deposited On:29 May 2013 09:44
Last Modified:08 May 2014 23:17

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