elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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. doi: 10.1007/s00348-021-03149-z. ISSN 0723-4864.

[img] PDF - Published version
5MB

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

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 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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Saile, DominikDominik.Saile (at) dlr.dehttps://orcid.org/0000-0002-4631-2072
Kühl, ViktorViktor.Kuehl (at) dlr.deUNSPECIFIED
Gülhan, AliAli.Guelhan (at) dlr.dehttps://orcid.org/0000-0003-4905-5881
Date:19 May 2021
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:62
DOI :10.1007/s00348-021-03149-z
Page Range:pp. 1-14
Publisher:Springer
ISSN:0723-4864
Status:Published
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 > Supersonoc and Hypersonic Technology
Deposited By: Saile, Dominik
Deposited On:07 Jun 2021 13:04
Last Modified:24 May 2022 23:47

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.