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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/ | |||||||||
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| 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: |
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| 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 (old) | |||||||||
| 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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