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On the subsonic near-wake of a space launcher configuration with exhaust jet

Saile, Dominik and Kühl, Viktor and Gülhan, Ali (2019) On the subsonic near-wake of a space launcher configuration with exhaust jet. Experiments in Fluids, 60 (11), p. 165. Springer. doi: 10.1007/s00348-019-2801-7. ISSN 0723-4864.

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Official URL: https://link.springer.com/article/10.1007%2Fs00348-019-2801-7

Abstract

The Ariane 5 failure flight 157 made clear that the loads in the base region of space launcher configurations were underestimated and its near-wake dynamics required more attention. In the recent years, many studies have been published on buffet/buffeting in the critical high subsonic flow regime. Nevertheless, not much experimental data are available on the interaction of the ambient flow with an exhaust jet over a wide subsonic Mach number range. Further, a preceding study without exhaust jet revealed questions regarding a similar distribution of the velocity and Reynolds stress in the near-wake if scaled with the reattachment length. Consequently, a generic space launcher configuration featuring a cold, supersonic, over-expanded jet is investigated experimentally in the vertical test section Cologne (VMK) by means of particle Image velocimetry (PIV) for five subsonic Mach numbers ranging from 0.5 to 0.9 with corresponding Reynolds numbers between ReD = 0.8 × 10^6 to 1.6 × 10^6. The velocity and Reynolds stress distribution are provided for the near-wake flow and additionally for the incoming boundary layer. Just as in the preceding study, self-similar features are found in the flow field as long as the separated shear layer reattaches on the solid nozzle wall. Substantial changes are then measured for an alternating (hybrid) reattachment between the solid nozzle wall and supersonic exhaust jet as found for Mach 0.8, one of them being the increased axial turbulence in the recirculation bubble due to a ‘dancing’ large-scale, clockwise-rotating vortex.

Item URL in elib:https://elib.dlr.de/129543/
Document Type:Article
Title:On the subsonic near-wake of a space launcher configuration with exhaust jet
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.deUNSPECIFIED
Date:10 October 2019
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:60
DOI :10.1007/s00348-019-2801-7
Page Range:p. 165
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:rocket, space transportation systems, Ariane 5, base flow, buffet, buffeting, subsonic, experiments, vertical test section cologne, wind tunnel, near-wake flow, flow interaction, jet, particle image velocimetry
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 - Raumfahrzeuge Entwurf, Systemanalyse, Simulation, Messtechnik (old), R - Raumfahrzeugsysteme - Anlagen u. Messtechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonoc and Hypersonic Technology
Deposited By: Saile, Dominik
Deposited On:23 Oct 2019 12:53
Last Modified:23 Oct 2019 12:53

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