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Pressure Drop Measurement of Porous Materials: Flashback Arrestors for a N2O/C2H4 Premixed Green Propellant

Werling, Lukas and Hauk, Andreas and Müller, Steffen and Ciezki, Helmut and Schlechtriem, Stefan (2016) Pressure Drop Measurement of Porous Materials: Flashback Arrestors for a N2O/C2H4 Premixed Green Propellant. In: 52nd AIAA/SAE/ASEE Joint Propulsion Conference. 52nd AIAA/SAE/ASEE Joint Propulsion Conference, 25.-27. Juli 2016, Salt Lake City, Utah, USA. doi: 10.2514/6.2016-5094.

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For more than 50 years hydrazine (N2H4) has been the most favored monopropellant concerning propulsion of satellites or planetary probes. Due to changing political framework (e.g.the REACH regulation), growing commercial pressure as well as the need for non-toxic alternatives, currently several so called "Green Propellants" for replacing hydrazine are under investigation. The most developed and prospective candidates are energetic ionic liquids e.g. ADN-based (LMP-103S/FLP-106) or HAN-based (AFM-315E) propellants. Furthermore the Green propellants like hydrogen peroxide or mixtures of nitrous oxide with hydrocarbons (e.g. NOFBXTM) can offer signifcant advantages compared to classical hydrazine. Aside with ADN-based monopropellants the German Aerospace Center's Institute of Space Propulsion in Lampoldshausen is carrying out research on a nitrous oxide/ethylene (N2O/C2H4) premixed propellant. The benefits of this propellant (high ISP> 300s and low toxicity) are facing several challenges, for example the need for a proper flashback-arrestor and the high combustion temperature (up to 3300K). DLR set up a test bench and designed a combustor to investigate the combustion and ignition behavior of the N2O/C2H4 mixture. One main task handling a premixed propellant is avoiding flashback at ignition, steady state operation or shutdown of the combustor. To prevent flashback the combustion chambers' injections system is equipped with porous elements. Thus when designing future thrusters or injection systems, knowledge of the pressure drop across the porous materials is indispensable. In this paper pressure drop measurements of five different gases with several porous materials will be shown and discussed. The results are compared to the classical Forchheimer model and an empirical fit with improved accuracy for high speed gas flows will be presented.

Item URL in elib:https://elib.dlr.de/105531/
Document Type:Conference or Workshop Item (Speech)
Title:Pressure Drop Measurement of Porous Materials: Flashback Arrestors for a N2O/C2H4 Premixed Green Propellant
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Werling, LukasLukas.Werling (at) dlr.dehttps://orcid.org/0000-0003-4353-2931
Hauk, AndreasAndreas.Hauk (at) dlr.deUNSPECIFIED
Müller, SteffenSteffen.Mueller (at) dlr.deUNSPECIFIED
Ciezki, HelmutHelmut.Ciezki (at) dlr.deUNSPECIFIED
Schlechtriem, Stefanstefan.schlechtriem (at) dlr.deUNSPECIFIED
Date:27 July 2016
Journal or Publication Title:52nd AIAA/SAE/ASEE Joint Propulsion Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Green Propellants, Nitrous Oxide, Porous Materials, Pressure drop, flashback arrestor, Premixed Propellant, Ethylene, Ethene, N2O, C2H4
Event Title:52nd AIAA/SAE/ASEE Joint Propulsion Conference
Event Location:Salt Lake City, Utah, USA
Event Type:international Conference
Event Dates:25.-27. Juli 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Future Fuels (old)
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Propellants
Deposited By: Werling, Lukas
Deposited On:22 Aug 2016 08:31
Last Modified:22 Aug 2016 08:31

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