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Boundary layer transition determination for periodic and static flows using phase-averaged pressure data

Gardner, Anthony Donald and Richter, Kai (2015) Boundary layer transition determination for periodic and static flows using phase-averaged pressure data. American Helicopter Society International, Inc.. AHS 71st Annual Forum, 05. - 07. May 2015, Virginia Beach, Virginia, USA.

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Official URL: https://vtol.org/events/ahs-71st-annual-forum-and-technology-display

Abstract

A method of boundary layer transition measurement is presented for wind tunnel models instrumented with surface pressure taps. The measurement relies on taking a number of theoretically identical measurements at different times and then analysing the standard deviation of the pressures. Due to the slight unsteady movement of the transition position, a peak in the standard deviation of pressure σCPpeak is found at the transition position, and this is correlated with measurements of the transition position with an infrared camera and hot film anemometers. In contrast to microphone measurements, it is shown that the transition detection works for data which has been low-pass filtered with a cutoff of 1 Hz. The application to static and dynamic transition measurements on static and periodically pitching helicopter rotor blade airfoils at Mach 0.3-0.5 is demonstrated.

Item URL in elib:https://elib.dlr.de/95090/
Document Type:Conference or Workshop Item (Speech)
Additional Information:AHS2015-000168
Title:Boundary layer transition determination for periodic and static flows using phase-averaged pressure data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gardner, Anthony Donaldtony.gardner (at) dlr.deUNSPECIFIED
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Date:2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-12
Publisher:American Helicopter Society International, Inc.
Series Name:Conference Proceedings on CD-ROM
Status:Published
Keywords:Boundary layer transition, wind tunnel, subsonic, helicopter, pitching airfoil
Event Title:AHS 71st Annual Forum
Event Location:Virginia Beach, Virginia, USA
Event Type:international Conference
Event Dates:05. - 07. May 2015
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
Deposited By: Micknaus, Ilka
Deposited On:04 Jun 2015 16:21
Last Modified:04 Jun 2015 16:21

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