Braukmann, Johannes N. und Wolf, Christian und Gardner, Anthony (2024) Application of BOS Velocimetry to Full-scale Helicopter Flight Tests. In: 80th Annual Vertical Flight Society Forum and Technology Display, FORUM 2024. Vertical Flight Society 80th Annual Forum & Technology Displays. Vertical Flight Society’s 80th Annual Forum & Technology Display, 2024-05-07 - 2024-05-09, Montréal, Québec, Canada. doi: 10.4050/F-0080-2024-1060. ISBN 978-171389794-1.
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Offizielle URL: https://vtol.org/forum
Kurzfassung
Time-resolved background-oriented schlieren (BOS) data are used to calculate the two-dimensional velocity field in the wake of free-flying full-scale helicopters in ground effect. The calculation is performed based on the density gradient pattern of the helicopter engine exhaust gas passing the BOS field of view. A classical BOS evaluation allows the visualization of density gradients such as vortices and the exhaust plume. The result is the BOS displacement field. Applying the two-dimensional divergence to this data results in a pattern that is constant in shape across multiple BOS images, but convects downstream with the outwash velocity of the helicopter. Using this data as input to a second, time resolved evaluation, quantitative two-dimensional velocity fields are calculated. Choosing an appropriate strategy for preparing and evaluating the data is critical to reliable velocity estimation. Another important aspect is to distinguish between reliable velocity data and erroneous results in areas of reduced signal intensity due to a lack of thermal structures. The velocity data obtained are compared with an analytical outwash model and constant temperature anemometry data acquired simultaneously with the BOS images. The data show good quantitative agreement in areas of sufficient thermal structures within the field of view.
elib-URL des Eintrags: | https://elib.dlr.de/204183/ | ||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||
Titel: | Application of BOS Velocimetry to Full-scale Helicopter Flight Tests | ||||||||||||||||
Autoren: |
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Datum: | 9 Mai 2024 | ||||||||||||||||
Erschienen in: | 80th Annual Vertical Flight Society Forum and Technology Display, FORUM 2024 | ||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||
Open Access: | Nein | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||
DOI: | 10.4050/F-0080-2024-1060 | ||||||||||||||||
Verlag: | Vertical Flight Society 80th Annual Forum & Technology Displays | ||||||||||||||||
Name der Reihe: | Test and Evaluation Technical Session | ||||||||||||||||
ISBN: | 978-171389794-1 | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | velocimetry, helicopter, outwash | ||||||||||||||||
Veranstaltungstitel: | Vertical Flight Society’s 80th Annual Forum & Technology Display | ||||||||||||||||
Veranstaltungsort: | Montréal, Québec, Canada | ||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
Veranstaltungsbeginn: | 7 Mai 2024 | ||||||||||||||||
Veranstaltungsende: | 9 Mai 2024 | ||||||||||||||||
Veranstalter : | Vertical Flight Society | ||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||
HGF - Programmthema: | Effizientes Luftfahrzeug | ||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||
DLR - Forschungsgebiet: | L EV - Effizientes Luftfahrzeug | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Virtueller Hubschrauber und Validierung | ||||||||||||||||
Standort: | Göttingen | ||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hubschrauber, GO | ||||||||||||||||
Hinterlegt von: | Koch, Bianca | ||||||||||||||||
Hinterlegt am: | 03 Jul 2024 14:26 | ||||||||||||||||
Letzte Änderung: | 03 Jul 2024 14:26 |
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