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Similarity and Key Parameters of Retropropulsion Assisted Deceleration in Hypersonic Wind Tunnels

Gutsche, Kevin and Marwege, Ansgar and Gülhan, Ali (2021) Similarity and Key Parameters of Retropropulsion Assisted Deceleration in Hypersonic Wind Tunnels. Journal of Spacecraft and Rockets. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.A34910. ISSN 0022-4650.

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Official URL: https://arc.aiaa.org/doi/10.2514/1.A34910


Retropropulsion, a decelerationtechniquewhere the thrust is directed along theflight path, is the drivingtechnology for vertically landing, reusable launchers. Experiments, which are indispensable for the full comprehension of retropropulsion flows, pose serious challenges to the operability of wind tunnels and interpretation of these subscale experiments. The key factors to facilitate meaningful results of supersonic and hypersonic retropropulsion experiments are addressed in this study. Similarity parameters for subscale experiments are evaluated, the interaction of retropropulsion flows with the test facility is investigated, and condensation within these flows is analyzed. For this purpose, computational fluid dynamics simulations were performed; subsequently, cold gas experiments for a generic retropropulsion launcher configuration with a single central nozzle were carried out in the hypersonic wind tunnel Cologne H2K at the Supersonic and Hypersonic Technologies Department of the DLR, German Aerospace Center. Based on these data, an improved similarity parameter related to the exit condition of the engine exhaust flow is proposed, and a universally applicable scaling law for supersonic retropropulsion wind-tunnel models is derived and validated. Various condensation mitigation techniques for the conducted experiments are presented, and their varying effectiveness is highlighted.

Item URL in elib:https://elib.dlr.de/143180/
Document Type:Article
Title:Similarity and Key Parameters of Retropropulsion Assisted Deceleration in Hypersonic Wind Tunnels
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Marwege, AnsgarUNSPECIFIEDhttps://orcid.org/0000-0002-3912-9114UNSPECIFIED
Date:21 May 2021
Journal or Publication Title:Journal of Spacecraft and Rockets
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Hypersonic Wind Tunnels, Experimental Investigation, Supersonic Retropropulsion, German Aerospace Center, Computational Fluid Dynamics Simulation, Condensation
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: Marwege, Ansgar
Deposited On:14 Jul 2021 16:20
Last Modified:14 Jul 2021 16:20

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