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On Subsonic Near-Wake Flows of a Space Launcher Configuration with Various Base Geometries

Saile, Dominik and Kühl, Viktor and Gülhan, Ali (2019) On Subsonic Near-Wake Flows of a Space Launcher Configuration with Various Base Geometries. 13th International Symposium on Particle Image Velocimetry – ISPIV 2019, July 22-24, 2019, Munich, Germany.

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Official URL: https://athene-forschung.unibw.de/128754?show_id=128827

Abstract

Buffet/buffeting as load imposing mechanism on the base structures of space launcher has been of strong interest ever since it was found as partially responsible for the failure flight 157 of Ariane 5. Several studies suggested that the base region is most excited at Mach 0:8. A preceding study of the current series on base flow effects revealed a differing excitation in comparison to the other subsonic Mach number cases. It featured an especially pronounced excitation in the recirculation region. Thus, the current work attempts to answer the question why this case appears to be distinct. This is done by decreasing the relative nozzle length and focusing on the Reynolds stress distribution. The research question is approached by experiments in the Vertical Test Section Cologne (VMK) on a base rocket model with supersonic, over-expanded exhaust jet exposed to an ambient flow at Mach 0.8 and a Reynolds number of 1.4·10^6. Data is acquired by means of particle image velocimetry (PIV). The results reveal that a most unfavorable configuration appears to exist, which is if the mean shear layer reattachment takes place just on the tip of the nozzle.

Item URL in elib:https://elib.dlr.de/128617/
Document Type:Conference or Workshop Item (Speech)
Title:On Subsonic Near-Wake Flows of a Space Launcher Configuration with Various Base Geometries
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Saile, DominikDominik.Saile (at) dlr.dehttps://orcid.org/0000-0002-4631-2072
Kühl, ViktorViktor.Kuehl (at) dlr.deUNSPECIFIED
Gülhan, AliAli.Gülhan (at) dlr.deUNSPECIFIED
Date:22 July 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Buffet/buffeting, space Transportation Systems, near-wake flow, base flow, flow interaction, co-flow, particle Image velocimetry, transonic, nozzle length Variation, experiments, VMK, vertical measurement section Cologne, Jet flow,
Event Title:13th International Symposium on Particle Image Velocimetry – ISPIV 2019
Event Location:Munich, Germany
Event Type:international Conference
Event Dates:July 22-24, 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonoc and Hypersonic Technology
Deposited By: Saile, Dominik
Deposited On:29 Jul 2019 11:41
Last Modified:31 Jul 2019 20:26

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