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Theoretical and Experimental Analysis of Liquid Layer Instabilities in Hybrid Rocket Engines

Kobald, Mario and Verri, I. and Schlechtriem, S. (2015) Theoretical and Experimental Analysis of Liquid Layer Instabilities in Hybrid Rocket Engines. CEAS Space Journal, 7 (1), pp. 11-22. Springer. doi: 10.1007/s12567-015-0076-2. ISSN 1868-2502.

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The combustion behavior of different hybrid rocket fuels has been analyzed in the frame of this research. Tests have been performed in a 2D slab burner configuration with windows on two sides. Four different liquefying paraffin-based fuels, hydroxyl terminated polybutadiene (HTPB) and high-density polyethylene (HDPE) have been tested in combination with gaseous oxygen (GOX). Experimental high-speed video data have been analyzed manually and with the proper orthogonal decomposition (POD) technique. Application of POD enables the recognition of the main structures of the flow field and the combustion flame appearing in the video data. These results include spatial and temporal analysis of the structures. For liquefying fuels these spatial values relate to the wavelengths associated to the Kelvin Helmholtz Instability (KHI). A theoretical long-wave solution of the KHI problem shows good agreement with the experimental results. Distinct frequencies found in the POD analysis can be related to the precombustion chamber configuration which can lead to vortex shedding phenomena.

Item URL in elib:https://elib.dlr.de/96149/
Document Type:Article
Title:Theoretical and Experimental Analysis of Liquid Layer Instabilities in Hybrid Rocket Engines
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kobald, Mariomario.kobald (at) dlr.dehttps://orcid.org/0000-0002-1708-3944
Schlechtriem, S.Stefan.Schlechtriem (at) dlr.deUNSPECIFIED
Date:March 2015
Journal or Publication Title:CEAS Space Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 11-22
Keywords:Hybrid Rocket Propulsion, Paraffin Fuels, Kelvin Helmholtz instability
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 - Antriebsystemtechnik - Raketenantriebtests (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Propellants
Deposited By: Kobald, Dr. Mario
Deposited On:04 May 2015 11:06
Last Modified:14 Dec 2019 04:27

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