Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry:
Stereoscopic and Multi-plane PIV measurements on artificially excited transitional boundary layer flows along a flat plate will be presented. The experimental results are focused on the structures of the late stages of K- and Oblique-type transition and on the substructures and the development of a...
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Format: | Abschlussarbeit Elektronisch E-Book |
Sprache: | German |
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Göttingen
2001
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Schlagworte: | |
Online-Zugang: | kostenfrei Volltext |
Zusammenfassung: | Stereoscopic and Multi-plane PIV measurements on artificially excited transitional boundary layer flows along a flat plate will be presented. The experimental results are focused on the structures of the late stages of K- and Oblique-type transition and on the substructures and the development of a turbulent spot induced by a short locally blown injection of air. Instantaneous velocity fields are examined in order to quantify the local and global dynamics of the structures leading into fully turbulent flow. A statistical analysis of the turbulent spot flow field has been carried out from the measurements consisting of calculations of ensemble averages, rms-fields, Galilean accelerations, probability density functions and space-time-correlations of the velocity fluctuations, the Reynolds stresses of all four quadrants and the y-component of the vorticity. The results of this analysis lead to a model which can describe the interaction of the dominant substructures of the spot and the fluid exchange normal to the wall. The dominant substructures have been identified as relative ordered hairpin-like vortices and wall near streaks. This model enables an explanation for the growth of the spot in both stream-wise and span-wise directions and the self-similar arrowhead shape. |
Beschreibung: | 1 Online-Ressource ( 133 Seiten) Illustrationen, Diagramme |
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100 | 1 | |a Schröder, Andreas |d 1968- |e Verfasser |0 (DE-588)123567858 |4 aut | |
245 | 1 | 0 | |a Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry |c Andreas Schröder |
264 | 1 | |a Göttingen |c 2001 | |
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502 | |b Dissertation |c Universtät Göttingen |d 2001 | ||
520 | 3 | |a Stereoscopic and Multi-plane PIV measurements on artificially excited transitional boundary layer flows along a flat plate will be presented. The experimental results are focused on the structures of the late stages of K- and Oblique-type transition and on the substructures and the development of a turbulent spot induced by a short locally blown injection of air. Instantaneous velocity fields are examined in order to quantify the local and global dynamics of the structures leading into fully turbulent flow. A statistical analysis of the turbulent spot flow field has been carried out from the measurements consisting of calculations of ensemble averages, rms-fields, Galilean accelerations, probability density functions and space-time-correlations of the velocity fluctuations, the Reynolds stresses of all four quadrants and the y-component of the vorticity. The results of this analysis lead to a model which can describe the interaction of the dominant substructures of the spot and the fluid exchange normal to the wall. The dominant substructures have been identified as relative ordered hairpin-like vortices and wall near streaks. This model enables an explanation for the growth of the spot in both stream-wise and span-wise directions and the self-similar arrowhead shape. | |
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Datensatz im Suchindex
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author | Schröder, Andreas 1968- |
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indexdate | 2024-07-10T08:40:04Z |
institution | BVB |
language | German |
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physical | 1 Online-Ressource ( 133 Seiten) Illustrationen, Diagramme |
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publishDate | 2001 |
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spelling | Schröder, Andreas 1968- Verfasser (DE-588)123567858 aut Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry Andreas Schröder Göttingen 2001 1 Online-Ressource ( 133 Seiten) Illustrationen, Diagramme txt rdacontent c rdamedia cr rdacarrier Dissertation Universtät Göttingen 2001 Stereoscopic and Multi-plane PIV measurements on artificially excited transitional boundary layer flows along a flat plate will be presented. The experimental results are focused on the structures of the late stages of K- and Oblique-type transition and on the substructures and the development of a turbulent spot induced by a short locally blown injection of air. Instantaneous velocity fields are examined in order to quantify the local and global dynamics of the structures leading into fully turbulent flow. A statistical analysis of the turbulent spot flow field has been carried out from the measurements consisting of calculations of ensemble averages, rms-fields, Galilean accelerations, probability density functions and space-time-correlations of the velocity fluctuations, the Reynolds stresses of all four quadrants and the y-component of the vorticity. The results of this analysis lead to a model which can describe the interaction of the dominant substructures of the spot and the fluid exchange normal to the wall. The dominant substructures have been identified as relative ordered hairpin-like vortices and wall near streaks. This model enables an explanation for the growth of the spot in both stream-wise and span-wise directions and the self-similar arrowhead shape. Sprache der Zusammenfassung: Englisch Grenzschichtströmung (DE-588)4137696-1 gnd rswk-swf Particle-Image-Velocimetry (DE-588)4333165-8 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Grenzschichtströmung (DE-588)4137696-1 s Particle-Image-Velocimetry (DE-588)4333165-8 s DE-604 Göttingen uvp http://webdoc.sub.gwdg.de/diss/2001/schroeder/index.html Verlag kostenfrei Volltext https://nbn-resolving.org/urn:nbn:de:gbv:7-webdoc-1083-0 Resolving-System Volltext |
spellingShingle | Schröder, Andreas 1968- Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry Grenzschichtströmung (DE-588)4137696-1 gnd Particle-Image-Velocimetry (DE-588)4333165-8 gnd |
subject_GND | (DE-588)4137696-1 (DE-588)4333165-8 (DE-588)4113937-9 |
title | Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry |
title_auth | Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry |
title_exact_search | Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry |
title_full | Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry Andreas Schröder |
title_fullStr | Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry Andreas Schröder |
title_full_unstemmed | Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry Andreas Schröder |
title_short | Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry |
title_sort | untersuchung der strukturen von kunstlich angeregten transitionellen plattengrenzschichtstromungen mit hilfe der stereo und multiplane particle image velocimetry |
topic | Grenzschichtströmung (DE-588)4137696-1 gnd Particle-Image-Velocimetry (DE-588)4333165-8 gnd |
topic_facet | Grenzschichtströmung Particle-Image-Velocimetry Hochschulschrift |
url | http://webdoc.sub.gwdg.de/diss/2001/schroeder/index.html https://nbn-resolving.org/urn:nbn:de:gbv:7-webdoc-1083-0 |
work_keys_str_mv | AT schroderandreas untersuchungderstrukturenvonkunstlichangeregtentransitionellenplattengrenzschichtstromungenmithilfederstereoundmultiplaneparticleimagevelocimetry |