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Cold spray deposition: A study of supersonic jet impingement

Rein, Martin (2008) Cold spray deposition: A study of supersonic jet impingement. Center of Excellence for Research and Education on Complex Functional Mechanical Systems Seminar, 2008-02-20, Kyoto (Japan). (Unpublished)

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Transonic flow phenomena and the generation of sound 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.

Item URL in elib:https://elib.dlr.de/53629/
Document Type:Conference or Workshop Item (Speech)
Title:Cold spray deposition: A study of supersonic jet impingement
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:20 February 2008
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:supersonic jet, impingement, sound generation, transonic flows, shock waves
Event Title:Center of Excellence for Research and Education on Complex Functional Mechanical Systems Seminar
Event Location:Kyoto (Japan)
Event Type:Other
Event Dates:2008-02-20
Organizer:The 21st Centuary COE Program
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:07 Apr 2008
Last Modified:27 Apr 2009 14:49

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