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Experimental and Numerical Analysis of the Heat Flux occurring in a Nitrous Oxide/Ethene Green Propellant Combustion Demonstrator

Werling, Lukas and Hochheimer, Benjamin and Baral, Adrian and Ciezki, Helmut and Schlechtriem, Stefan (2015) Experimental and Numerical Analysis of the Heat Flux occurring in a Nitrous Oxide/Ethene Green Propellant Combustion Demonstrator. In: 51st AIAA/SAE/ASEE Joint Propulsion Conference. 51th AIAA/SAE/ASEE Joint Propulsion Conference, 27.-29. Juli 2015, Orlando, Florida, USA.

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Abstract

Since the early days of space fight hydrazine is used as a monopropellant to power rockets, satellites or planetary probes. Due to the growing commercial pressure on users and suppliers as well as the need for non-toxic alternatives, several so called "Green Propellants" are under investigation for replacing hydrazine. The most prospective candidates seem to be ionic liquids e.g. HAN-based (AFM-315E) or ADN-based (LMP-103S/FLP-106), hydrogen peroxide or nitrous oxide fuel blends (e.g. NOFBXTM). Aside with ADN-based monopropellants the German Aerospace Center's Institute of Space Propulsion in Lampoldshausen is carrying out research on a nitrous oxide/ethene (N2O/C2H4) premixed monopropellant. The benefits of this propellant (ISP about 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). To investigate the combustion, injection and ignition behavior a combustion chamber was manufactured and a test bench was built up. The combustion chamber consists of capacitively cooled segments. The heat flux inside the chamber walls during hot runs was evaluated by comparing the temperature development with the results of several CFD simulations. The simulations were carried out using Ansys CFX. By using the results of the simulations and the evaluated heat flux, water-cooled combustion chamber segment were designed and manufactured. To perform experiments with the chamber segments operation points for the coolant mass ow were derived. For comparing the real ow condition to the behavior of the simulated flow inside the cooling channel, a measuring section was set up. The mass flow, the temperature and the pressure drop of the cooling water was measured and compared with the results of the simulations. Taking the inlet zone and the sensor position into account, the simulated values for pressure drop agree well with the measured data. In this paper the results of the first combustion tests, the estimated heat ux and the numerical and experimental results of the flow behavior inside the cooling channels are presented.

Item URL in elib:https://elib.dlr.de/98104/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental and Numerical Analysis of the Heat Flux occurring in a Nitrous Oxide/Ethene Green Propellant Combustion Demonstrator
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Werling, LukasLukas.Werling (at) dlr.deUNSPECIFIED
Hochheimer, BenjaminRA-TRS LAUNSPECIFIED
Baral, AdrianRA-TRS LAUNSPECIFIED
Ciezki, Helmuthelmut.ciezki (at) dlr.deUNSPECIFIED
Schlechtriem, Stefanstefan.schlechtriem (at) dlr.deUNSPECIFIED
Date:28 July 2015
Journal or Publication Title:51st AIAA/SAE/ASEE Joint Propulsion Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Green Propellants, Heat flux, Nitrous Oxide, ethene, N2O, C2H4, premixed, monopropellant, numerical simulations
Event Title:51th AIAA/SAE/ASEE Joint Propulsion Conference
Event Location:Orlando, Florida, USA
Event Type:international Conference
Event Dates:27.-29. Juli 2015
Organizer:AIAA
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):R - Vorhaben ForTrAS - Fortschrittliche Treibstoffe für Anwendungen im Satellitenbereich
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion
Deposited By: Werling, Lukas
Deposited On:14 Sep 2015 08:28
Last Modified:14 Sep 2015 08:28

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