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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 (2021) On subsonic near-wake flows of a space launcher configuration with various base geometries. Experiments in Fluids, 62 (122), pp. 1-14. Springer Nature. doi: 10.1007/s00348-021-03149-z. ISSN 0723-4864.

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Official URL: https://doi.org/10.1007/s00348-021-03149-z


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 failed 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 model with supersonic, over-expanded exhaust jet exposed to an ambient flow at Mach 0.8 and a Reynolds number of 1.4x10^6 . Data are acquired by means of particle image velocimetry (PIV) and high-speed schlieren imaging. 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/142347/
Document Type:Article
Title:On subsonic near-wake flows of a space launcher configuration with various base geometries
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Saile, DominikUNSPECIFIEDhttps://orcid.org/0000-0002-4631-2072UNSPECIFIED
Gülhan, AliUNSPECIFIEDhttps://orcid.org/0000-0003-4905-5881UNSPECIFIED
Date:19 May 2021
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-14
Publisher:Springer Nature
Keywords:buffet, buffeting, near-wake flow, jet, base flow interaction, particle image velocimetry, VMK, vertical test section cologne, wind tunnel experiments, space transportation systems, rocket, transonic, Ariane 5, base configurations, proper orthogonal decomposition, spectral analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Reusable Space Systems and Propulsion Technology
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonic and Hypersonic Technology
Deposited By: Saile, Dominik
Deposited On:07 Jun 2021 13:04
Last Modified:12 May 2023 13:06

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