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Gardner, Anthony and Weiss, Armin and Heineck, James T. and Overmeyer, Austin and Spooner, Hanna and Jain, R. K. and Wolf, Christian and Raffel, Markus (2021) Boundary layer transition measured by DIT on the PSP rotor in forward flight. In: Vertical Flight Society's 77th Annual Forum and Technology Display. Vertical Flight Society's 77th Annual Forum 2021, 10.-14. Mai 2021, Virtuell.
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Official URL: https://vtol.org/annual-forum/forum-77-proceedings-and-access
Abstract
A well-defined reference set of data for CFD and comprehensive code validation for a scaled helicopter main rotor with boundary layer transition in forward flight is presented. The boundary layer transition was measured using Differential Infrared Thermography (DIT) on the top (suction) side of the NASA/Army “PSP rotor” in the NASA Langley 14- by 22-Foot Subsonic Tunnel. The tests used a FLIR X8500 SLS long-wave infrared camera to observe the three-bladed rotor. The boundary layer transition was detected for forward flight at an advance ratio of 0.3 (115 kt). The measured boundary layer transition positions are consistent with previous measurements and predicted boundary layer transition locations. A method for the analysis of DIT images for a rotor in forward flight is shown and validated based on computational analysis of a pitching airfoil with varying inflow, showing both qualitative and quantitative similarity to experimental data.
| Item URL in elib: | https://elib.dlr.de/141957/ | |||||||||||||||||||||||||||
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| Document Type: | Conference or Workshop Item (Speech) | |||||||||||||||||||||||||||
| Title: | Boundary layer transition measured by DIT on the PSP rotor in forward flight | |||||||||||||||||||||||||||
| Authors: |
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| Date: | May 2021 | |||||||||||||||||||||||||||
| Journal or Publication Title: | Vertical Flight Society's 77th Annual Forum and Technology Display | |||||||||||||||||||||||||||
| Refereed publication: | Yes | |||||||||||||||||||||||||||
| Open Access: | No | |||||||||||||||||||||||||||
| Gold Open Access: | No | |||||||||||||||||||||||||||
| In SCOPUS: | No | |||||||||||||||||||||||||||
| In ISI Web of Science: | No | |||||||||||||||||||||||||||
| Status: | Published | |||||||||||||||||||||||||||
| Keywords: | Boundary layer, Transition, helicopter, rotor, infrared, thermography, experiment | |||||||||||||||||||||||||||
| Event Title: | Vertical Flight Society's 77th Annual Forum 2021 | |||||||||||||||||||||||||||
| Event Location: | Virtuell | |||||||||||||||||||||||||||
| Event Type: | international Conference | |||||||||||||||||||||||||||
| Event Dates: | 10.-14. Mai 2021 | |||||||||||||||||||||||||||
| Organizer: | Vertical Flight Society | |||||||||||||||||||||||||||
| HGF - Research field: | Aeronautics, Space and Transport | |||||||||||||||||||||||||||
| HGF - Program: | Aeronautics | |||||||||||||||||||||||||||
| HGF - Program Themes: | Efficient Vehicle | |||||||||||||||||||||||||||
| DLR - Research area: | Aeronautics | |||||||||||||||||||||||||||
| DLR - Program: | L EV - Efficient Vehicle | |||||||||||||||||||||||||||
| DLR - Research theme (Project): | L - Virtual Rotorcraft and Validation | |||||||||||||||||||||||||||
| Location: | Göttingen | |||||||||||||||||||||||||||
| Institutes and Institutions: | Institute for Aerodynamics and Flow Technology > Helicopter, GO | |||||||||||||||||||||||||||
| Deposited By: | Carter, Beatrice | |||||||||||||||||||||||||||
| Deposited On: | 14 Jul 2021 15:21 | |||||||||||||||||||||||||||
| Last Modified: | 14 Jul 2021 15:34 |
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