Thavamani, Aswin und Cuvier, Christophe und Willert, Christian und Foucaut, Jean Marc und Atkinson, Callum und Soria, Julio (2020) Characterisation of uniform momentum zones in adverse pressure gradient turbulent boundary layers. Experimental Thermal and Fluid Science, 115, Seite 110080. Elsevier. doi: 10.1016/j.expthermflusci.2020.110080. ISSN 0894-1777.
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Offizielle URL: https://doi.org/10.1016/j.expthermflusci.2020.110080
Kurzfassung
Uniform momentum zones (UMZs) for an adverse pressure gradient turbulent boundary layer (APG-TBL) are characterised in this paper. The database described by Cuvier et al. [2017], which was obtained using 2-component 2-dimensional (2C-2D) particle image velocimetry (PIV) at two free-stream velocities of 5 m/s and 9 m/s, is used for this study. The methodology described by Adrian et al. [2000] is used to identify and hence, statistically characterise the UMZs and UMZ interfaces in the APG-TBL. This study shows that the number of detected UMZs increases in the streamwise direction for both free-stream velocities. This increase is primarily thought to be due to the adverse pressure gradient (APG) since a comparison of the results between the two free-stream velocity APG-TBLs did not show any statistically significant difference with Re_\theta for the range of Reynolds number examined in this study. The thickness of the UMZs, \delta w and the jump in streamwise velocity across the UMZ interface were found to increase in the wall-normal direction, whereas the width of the UMZ interface, \delta u, was found to decrease. The number of UMZs, N_umz, identified appeared to influence the modal velocities/uniform velocities, geometrical properties of the UMZs and statistics of the flow. With increasing N_umz, the modal velocities of the UMZs moved to higher values to accommodate new UMZs that developed closer to the wall and the thickness of each UMZ and \delta u across the UMZ interface decreased, whereas \delta w increased. A slight difference in the magnitude of streamwise Reynolds stress and Reynolds shear stress was observed in the inner and outer regions, and a slight difference in the magnitude of turbulence production was also observed in the inner region between the velocity fields having a low or high number of UMZs indicating that the flow statistics are influenced by the number of UMZs present in the APG-TBL.
elib-URL des Eintrags: | https://elib.dlr.de/134219/ | ||||||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||
Titel: | Characterisation of uniform momentum zones in adverse pressure gradient turbulent boundary layers | ||||||||||||||||||||||||||||
Autoren: |
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Datum: | 2020 | ||||||||||||||||||||||||||||
Erschienen in: | Experimental Thermal and Fluid Science | ||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||
Band: | 115 | ||||||||||||||||||||||||||||
DOI: | 10.1016/j.expthermflusci.2020.110080 | ||||||||||||||||||||||||||||
Seitenbereich: | Seite 110080 | ||||||||||||||||||||||||||||
Verlag: | Elsevier | ||||||||||||||||||||||||||||
ISSN: | 0894-1777 | ||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||
Stichwörter: | uniform momentum zones; turbulent boundary layer; adverse pressure gradient; particle image velocimetry; PIV | ||||||||||||||||||||||||||||
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: | 26 Okt 2020 09:56 | ||||||||||||||||||||||||||||
Letzte Änderung: | 16 Jun 2023 10:15 |
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