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A PREMIXED GREEN PROPELLANT CONSISTING OF N2O AND C2H4: EXPERIMENTAL ANALYSIS OF QUENCHING DIAMETERS TO DESIGN FLASHBACK ARRESTERS

Werling, Lukas and Jooß, Yannick and Wenzel, Maximilian and Ciezki, Helmut and Schlechtriem, Stefan (2019) A PREMIXED GREEN PROPELLANT CONSISTING OF N2O AND C2H4: EXPERIMENTAL ANALYSIS OF QUENCHING DIAMETERS TO DESIGN FLASHBACK ARRESTERS. International Journal of Energetic Materials and Chemical Propulsion, 17 (3), pp. 241-262. Begell House. DOI: 10.1615/IntJEnergeticMaterialsChemProp.2019027950 ISSN 2150-766X

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Official URL: http://dl.begellhouse.com/journals/17bbb47e377ce023,7470a69b0161120b,4b5aa430518d37c3.html

Abstract

Across the world several so-called green propellants for in-space and orbital propulsion are investigated to replace the highly toxic hydrazine. Aside from green alternatives based on ADN and H2O2, the DLR Institute of Space Propulsion examines a premixed propellant consisting of dinitrogen monoxide (N2O) and ethene (C2H4). The mixture called HyNOx (hydrocarbons mixed with nitrous oxide) offers high performance and low toxicity, but due to the premixed state, the danger of flame flashback across the injection system is a major issue. To avoid flashback during operation of a future engine, suitable flashback arresters are needed; thus, the quenching diameters and corresponding quenching Peclet numbers have to be derived. To analyze the quenching diameters, DLR uses an ignition and flashback test setup. The setup consists of two chambers separated by a fitting for capillaries which serve as flashback arresters. Capillaries with diameters between 0.1 and 0.5 mm were examined regarding their ability to quench the flame. Furthermore, one chamber can be equipped with glass windows to record high-speed videos of the flame propagation process. To obtain the critical quenching Peclet number the ignition pressure was consecutively raised until a flame flashback for a given capillary was observed. The quenching Peclet numbers were calculated according to the gas state at ignition. This resulted in critical Peclet numbers between 30 and 40. Additionally, highspeed videos were recorded to analyze the flame propagation speed during the combustion process. The average flame propagation speed was between 33 m/s for an ignition pressure of 0.49 bar and 40 m/s for an ignition pressure of 1 bar.

Item URL in elib:https://elib.dlr.de/130882/
Document Type:Article
Title:A PREMIXED GREEN PROPELLANT CONSISTING OF N2O AND C2H4: EXPERIMENTAL ANALYSIS OF QUENCHING DIAMETERS TO DESIGN FLASHBACK ARRESTERS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Werling, LukasLukas.Werling (at) dlr.dehttps://orcid.org/0000-0003-4353-2931
Jooß, YannickInstitut für Raumfahrtantriebe, DLR Lampoldshausen, DUNSPECIFIED
Wenzel, MaximilianInstitut für Raumfahrtantriebe, DLR Lampoldshausen, DUNSPECIFIED
Ciezki, HelmutHelmut.Ciezki (at) dlr.dehttps://orcid.org/0000-0002-1539-4677
Schlechtriem, Stefanstefan.schlechtriem (at) dlr.dehttps://orcid.org/0000-0002-3714-9664
Date:2019
Journal or Publication Title:International Journal of Energetic Materials and Chemical Propulsion
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:17
DOI :10.1615/IntJEnergeticMaterialsChemProp.2019027950
Page Range:pp. 241-262
Publisher:Begell House
ISSN:2150-766X
Status:Published
Keywords:green propellants, nitrous oxide fuel blends, N2O, C2H4, flame flashback arresters, quenching diameters, Peclet numbers, flame propagation in closed volume, flame propagation speed
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 Future Fuels
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Propellants
Deposited By: Hanke, Michaela
Deposited On:26 Nov 2019 08:18
Last Modified:14 Dec 2019 04:23

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