Ma, Yingyu und Schröder, Andreas (2018) Reduced-order coherent structures in active flow separation control using a bio-inspired flapping actuator. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 232 (14), Seiten 2536-2545. SAGE Publications. doi: 10.1177/0954406217752531. ISSN 0954-4062.
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Offizielle URL: https://doi.org/10.1177/0954406217752531
Kurzfassung
An experimental study was conducted to investigate large-scale coherent structures induced by a bio-inspired flapping actuator in a turbulent backward-facing step flow. The flow field velocity dataset in the horizontal-vertical plane was obtained by planar particle image velocimetry. The flapping actuator was implemented over the step edge and it was driven to vertically oscillate, generating periodic small perturbations into the separated shear layer. As a result of active flow control, time-averaged reattachment length was reduced by 31% and Reynolds stresses as well as in-plane turbulent kinetic energy in the separated shear layer were considerably increased. In proper orthogonal decomposition analysis, the first two modes are found to be phase-correlated in the phase portrait of the coefficients. Therefore, reduced-order coherent structures are reconstructed by the first two modes, showing the phase evolution of the vortex shedding process. The extracted reduced-order coherent structures provide a better understanding of the underlying flow physics and are beneficial to effective flow separation control.
elib-URL des Eintrags: | https://elib.dlr.de/122425/ | ||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||
Zusätzliche Informationen: | Online ISSN: 2041-2983, Article first published online: January 10, 2018; Issue published: July 1, 2018 | ||||||||||||
Titel: | Reduced-order coherent structures in active flow separation control using a bio-inspired flapping actuator | ||||||||||||
Autoren: |
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Datum: | 1 Juli 2018 | ||||||||||||
Erschienen in: | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science | ||||||||||||
Referierte Publikation: | Ja | ||||||||||||
Open Access: | Nein | ||||||||||||
Gold Open Access: | Nein | ||||||||||||
In SCOPUS: | Ja | ||||||||||||
In ISI Web of Science: | Ja | ||||||||||||
Band: | 232 | ||||||||||||
DOI: | 10.1177/0954406217752531 | ||||||||||||
Seitenbereich: | Seiten 2536-2545 | ||||||||||||
Verlag: | SAGE Publications | ||||||||||||
Name der Reihe: | SAGE Journals | ||||||||||||
ISSN: | 0954-4062 | ||||||||||||
Status: | veröffentlicht | ||||||||||||
Stichwörter: | Active flow control, reduced-order, coherent structure, particle image velocimetry, proper orthogonal decomposition | ||||||||||||
Institution: | Deutsches Zentrum für Luft- und Raumfahrt e.V. | ||||||||||||
Abteilung: | AS-EXV | ||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||
HGF - Programmthema: | Flugzeuge | ||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||
DLR - Forschungsgebiet: | L AR - Aircraft Research | ||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Simulation und Validierung (alt) | ||||||||||||
Standort: | Göttingen | ||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO | ||||||||||||
Hinterlegt von: | Micknaus, Ilka | ||||||||||||
Hinterlegt am: | 05 Dez 2018 10:45 | ||||||||||||
Letzte Änderung: | 02 Nov 2023 10:12 |
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