Rein, Martin (2007) Simple and two-phase supersonic jets impinging on plates. GALCIT Colloquium, 2007-10-26, Pasadena, CA (USA).
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Kurzfassung
Fluid dynamic phenomena occurring during the impingement of a supersonic free jet on a plate have been studied both, experimentally and numerically. This happened under conditions typical of the cold spray deposition process. Therefore, also particle-laden jets were considered. Under certain conditions a recirculation bubble is formed in the shock layer ahead of the plate. Numerical computations of this flow that have been performed with the DLR TAU-code, are compared with shadowgraphs. Experimental results obtained with a newly developed multi-exposure method combined with synchronized pressure measurements, show that the formation of recirculation bubbles is typically connected with self-excited flow oscillations. Based on a spectral analysis, different mechanisms of self-excited oscillations are discussed and compared with related phenomena reported in the literature. The importance of flow oscillations on the behaviour of a particle cloud that is formed ahead of the plate in the case of two-phase flows, will also be explained. Finally, the emission of light that is sometimes observed when the metallic particles impinge on the metal plate with a high velocity, is traced to mechanoluminescence.
elib-URL des Eintrags: | https://elib.dlr.de/52748/ | ||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||
Titel: | Simple and two-phase supersonic jets impinging on plates | ||||||||
Autoren: |
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Datum: | 26 Oktober 2007 | ||||||||
Open Access: | Nein | ||||||||
Gold Open Access: | Nein | ||||||||
In SCOPUS: | Nein | ||||||||
In ISI Web of Science: | Nein | ||||||||
Stichwörter: | jet impingement,sound generation, transonic flows, particle impact | ||||||||
Veranstaltungstitel: | GALCIT Colloquium | ||||||||
Veranstaltungsort: | Pasadena, CA (USA) | ||||||||
Veranstaltungsart: | Andere | ||||||||
Veranstaltungsdatum: | 26 Oktober 2007 | ||||||||
Veranstalter : | Graduate Aeronautical Laboratories, California Institute of Technology | ||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||
HGF - Programm: | Luftfahrt | ||||||||
HGF - Programmthema: | Starrflügler (alt) | ||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||
DLR - Forschungsgebiet: | L AR - Starrflüglerforschung | ||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Militärische Technologien (alt) | ||||||||
Standort: | Göttingen | ||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hochgeschwindigkeitskonfigurationen | ||||||||
Hinterlegt von: | Rein, Prof.Dr. Martin | ||||||||
Hinterlegt am: | 18 Mär 2009 | ||||||||
Letzte Änderung: | 24 Apr 2024 19:15 |
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