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Influence of combustion chamber size (L*) on characteristic exhaust velocity (c*) for a N2O/C2H4 premixed green propellant

Werling, Lukas and Bätz, Patrick and Ciezki, Helmut and Schlechtriem, Stefan (2018) Influence of combustion chamber size (L*) on characteristic exhaust velocity (c*) for a N2O/C2H4 premixed green propellant. In: Space Propulsion Conference 2018. Space Propulsion Conference 2018, 14.-18. Mai 2018, Sevilla, Spanien.

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Abstract

Currently several so called “green propellants” are under investigation to replace the toxic monopropellant hydrazine (N2H4). Aside alternatives as Ammonium dinitramide (ADN)-based propellants, Hydroxylammonium nitrate (HAN)-based mixtures or high concentrated hydrogen peroxide (H2O2), a further promising propellant is a mixture of hydrocarbons with nitrous oxide - called HyNOx or NOFBX. Compared to classical hydrazine N2O/hydrocarbon mixtures offer a high Performance (Isp, c*) a negligible toxicity and low propellant costs. Those substances are also called “premixed monopropellants”: oxidizer and fuel are stored premixed in one tank. To gain experience with a propellant mixture consisting of nitrous oxide (N2O) and ethene (C2H4), DLR is conducting hot gas combustion tests with an experimental combustor. The paper summarizes the results of 134 combustion tests conducted with the premixed propellant injected in gaseous state. Calculated and measured performance (c* and eta c*) depending on mixture ratio, characteristic combustion chamber length (L*) and chamber pressure are shown and discussed. Furthermore the residence time scales of the propellant mixture inside the combustion chamber are normalized by the chemical time scale of the combustion process. Thus combustion efficiencies depending on dimensionless Damköhler numbers are derived.

Item URL in elib:https://elib.dlr.de/121182/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of combustion chamber size (L*) on characteristic exhaust velocity (c*) for a N2O/C2H4 premixed green propellant
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Werling, LukasLukas.Werling (at) dlr.dehttps://orcid.org/0000-0003-4353-2931
Bätz, PatrickUNSPECIFIEDUNSPECIFIED
Ciezki, HelmutHelmut.Ciezki (at) dlr.deUNSPECIFIED
Schlechtriem, StefanStefan.Schlechtriem (at) dlr.dehttps://orcid.org/0000-0002-3714-9664
Date:15 May 2018
Journal or Publication Title:Space Propulsion Conference 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Green propellants, nitrous oxide fuel blends, premixed monopropellant, nitrous oxide, ethene, N2O, C2H4, characteristic combustion chamber length (L*), characteristic velocity c*, combustion efficiency
Event Title:Space Propulsion Conference 2018
Event Location:Sevilla, Spanien
Event Type:international Conference
Event Dates:14.-18. Mai 2018
Organizer:3AF
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: Werling, Lukas
Deposited On:30 Jul 2018 08:51
Last Modified:30 Jul 2018 08:51

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