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Liquid Layer Combustion Instabilities in Paraffin-Based Hybrid Rocket Fuels

Petrarolo, Anna (2020) Liquid Layer Combustion Instabilities in Paraffin-Based Hybrid Rocket Fuels. Dissertation. DLR-Forschungsbericht. DLR-FB-2020-38, 180 S.

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Abstract

Hybrid rocket engines are a promising technology for a variety of applications, but their use has been hindered in the past due to some disadvantages derived from the characteristic diffusive flame mechanism. However, most of these drawbacks can be solved through a correct design process. In particular, the recent discovery of the so-called liquefying fuels allows to obtain higher regression rates due to a different combustion mechanism. The liquid layer combustion process of paraffin-based fuels in combination with gaseous oxygen has been visualized with different optical techniques in a 2D single slab burner at both sub- and super-critical pressure conditions. Fuel slab configuration and composition and oxidizer mass flow rate have been varied to understand their influence on the phenomenon. In all the tests, the flame is characterized by a wave-like structure, whose frequencies and wavelengths are determined by using decomposition algorithms. At elevated operating pressures, the flame becomes unsteady and highly turbulent.

Item URL in elib:https://elib.dlr.de/138127/
Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Title:Liquid Layer Combustion Instabilities in Paraffin-Based Hybrid Rocket Fuels
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Petrarolo, AnnaAnna.Petrarolo (at) dlr.dehttps://orcid.org/0000-0002-2291-2874
Date:2020
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:180
ISSN:1434-8454
Status:Published
Keywords:Hybrid rocket propulsion, entrainment, paraffin-based fuels, optical investigations, Proper Orthogonal Decomposition (POD), Independent Component Analysis (ICA), Kelvin-Helmholtz instability
Institution:Universität Stuttgart
Department:Institut für Raumfahrtsysteme
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):Project ATEK
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion
Deposited By: Petrarolo, Anna
Deposited On:16 Dec 2020 08:12
Last Modified:16 Dec 2020 08:12

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