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

Kobald, Mario and Verri, I. and Schlechtriem, S. (2014) Theoretical and Experimental Analysis of Liquid Layer Instability in Hybrid Rocket Engines. Space Propulsion 2014, 18.-22. Mai 2014, Köln, Deutschland.

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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 has 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 combustion flame appearing in the video data. These results include spatial and temporal analysis of the structures. For liquefying fuels these spatial values can be related 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 vortex shedding phenomena and acoustic combustion oscillations.

Item URL in elib:https://elib.dlr.de/90298/
Document Type:Conference or Workshop Item (Speech)
Title:Theoretical and Experimental Analysis of Liquid Layer Instability in Hybrid Rocket Engines
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kobald, MarioUNSPECIFIEDhttps://orcid.org/0000-0002-1708-3944
Date:22 May 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Hybrid rocket propulsion, liquid layer instability, optical, paraffin fuel
Event Title:Space Propulsion 2014
Event Location:Köln, Deutschland
Event Type:international Conference
Event Dates:18.-22. Mai 2014
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
Deposited By: Kobald, Dr. Mario
Deposited On:18 Aug 2014 08:53
Last Modified:01 Dec 2018 19:50

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