Willert, Christian (2015) Experimental Evidence of Near-Wall Reverse Flow Events in a Zero Pressure Gradient Turbulent Boundary Layer. Cornell University Library. [sonstige Veröffentlichung]
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PDF (arXiv Submission)
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Offizielle URL: http://arxiv.org/abs/1507.00609
Kurzfassung
This study reports on experimentally observed near-wall reverse flow events in a fully developed flat plate boundary layer at zero pressure gradient with Reynolds numbers between Re\tau = 1000 and Re\tau = 2700. The reverse flow events are captured using high magnification particle image velocimetry sequences with record lengths varying from 50,000 to 126,000 samples. Time resolved particle image sequences allow singular reverse flow events to be followed over several time steps whereas long records of nearly statistically independent samples provide a variety of single snapshots at a higher spatial resolution. The probability of occurrence lies in the range of 0.01% to 0.1% which matches predictions made with direct numerical simulations (DNS). The self-similar size of the reverse flow bubble is about 30-50 wall units in length and 5 wall units in height which also agrees well to DNS data provided by Lenaers et al. (Phys.Fluids 24:035110 (2012)).
elib-URL des Eintrags: | https://elib.dlr.de/97112/ | ||||||||
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Dokumentart: | sonstige Veröffentlichung | ||||||||
Titel: | Experimental Evidence of Near-Wall Reverse Flow Events in a Zero Pressure Gradient Turbulent Boundary Layer | ||||||||
Autoren: |
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Datum: | 2 Juli 2015 | ||||||||
Erschienen in: | arXiv | ||||||||
Referierte Publikation: | Nein | ||||||||
Open Access: | Ja | ||||||||
Seitenanzahl: | 8 | ||||||||
Verlag: | Cornell University Library | ||||||||
Name der Reihe: | physics.flu-dyn | ||||||||
Status: | veröffentlicht | ||||||||
Stichwörter: | particle image velocimetry, turbulence statistics, boundary layer, flow reversal, wall shear stress, PIV, visualization, near-wall turbulence | ||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||
HGF - Programm: | Luftfahrt | ||||||||
HGF - Programmthema: | Antriebssysteme | ||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||
DLR - Forschungsgebiet: | L ER - Engine Research | ||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Virtuelles Triebwerk und Validierungsmethoden (alt) | ||||||||
Standort: | Köln-Porz | ||||||||
Institute & Einrichtungen: | Institut für Antriebstechnik > Triebwerksmesstechnik | ||||||||
Hinterlegt von: | Willert, Dr.phil. Christian | ||||||||
Hinterlegt am: | 16 Jul 2015 10:07 | ||||||||
Letzte Änderung: | 31 Jul 2019 19:53 |
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