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Gardner, Anthony D. and Wolf, C. Christian and Heineck, James T. and Barnett, Miles and Raffel, Markus (2019) Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera. In: Proceedings of the 75th Annual Forum and Technology Display, pp. 1-13. VFS 75th Annual Forum & Technology Display, 13.-16. Mai 2019, Philadelphia, PA, USA.
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Abstract
Boundary layer transition measurement was demonstrated using differential infrared thermography on the top side of a helicopter rotor in forward flight. The tests used a FLIR X8500xc SLS long wave infrared camera to observe the DLR EC135 test helicopter rotor. The boundary layer transition was detected for hover out of ground effect (150 ft) and for forward flight at 80 kt (1700 ft). The measured boundary layer transition positions are consistent with previous measurements of the EC135 hovering in ground effect, and with predicted boundary layer transition positions. A method for the analysis of DIT images for a rotor in forward flight is shown, based on computational analysis of a pitching airfoil with varying inflow.
| Item URL in elib: | https://elib.dlr.de/126826/ | ||||||||||||||||||
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| Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||||
| Title: | Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera | ||||||||||||||||||
| Authors: |
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| Date: | May 2019 | ||||||||||||||||||
| Journal or Publication Title: | Proceedings of the 75th Annual Forum and Technology Display | ||||||||||||||||||
| Refereed publication: | Yes | ||||||||||||||||||
| Open Access: | No | ||||||||||||||||||
| In SCOPUS: | Yes | ||||||||||||||||||
| In ISI Web of Science: | No | ||||||||||||||||||
| Page Range: | pp. 1-13 | ||||||||||||||||||
| Series Name: | Conference Proceedings digital | ||||||||||||||||||
| Status: | Published | ||||||||||||||||||
| Keywords: | boundary layer transition, helicopter, infrared thermography, DIT, flight test | ||||||||||||||||||
| Event Title: | VFS 75th Annual Forum & Technology Display | ||||||||||||||||||
| Event Location: | Philadelphia, PA, USA | ||||||||||||||||||
| Event Type: | international Conference | ||||||||||||||||||
| Event Dates: | 13.-16. Mai 2019 | ||||||||||||||||||
| Organizer: | AHS - The Vertical Flight Society | ||||||||||||||||||
| 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: | Braunschweig , Göttingen | ||||||||||||||||||
| Institutes and Institutions: | Institute for Aerodynamics and Flow Technology > Helicopter, GO Flight Experiments > Braunschweig | ||||||||||||||||||
| Deposited By: | Winkels, Elisabeth | ||||||||||||||||||
| Deposited On: | 12 Jun 2019 10:39 | ||||||||||||||||||
| Last Modified: | 19 Sep 2019 13:33 |
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