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Simple and two-phase supersonic jets impinging on plates

Rein, Martin (2007) Simple and two-phase supersonic jets impinging on plates. GALCIT Colloquium, 2007-10-26, Pasadena, CA (USA).

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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.

Item URL in elib:https://elib.dlr.de/52748/
Document Type:Conference or Workshop Item (Speech)
Title:Simple and two-phase supersonic jets impinging on plates
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:26 October 2007
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:jet impingement,sound generation, transonic flows, particle impact
Event Title:GALCIT Colloquium
Event Location:Pasadena, CA (USA)
Event Type:Other
Event Dates:2007-10-26
Organizer:Graduate Aeronautical Laboratories, California Institute of Technology
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Military Technologies (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Rein, Prof.Dr. Martin
Deposited On:18 Mar 2009
Last Modified:27 Apr 2009 14:38

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