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• W2024649314 abstract "Degradation of monopropellant hydrazine thruster by Non Volatile Residues (NVR) has been observed in America and in Europe. The implementation of stringent cleanliness requirements on hardware and fluid is not considered to be a satisfactory solution. One particular NVR: silica, has been found in hydrazine after exposure to US (AFE332) and European (D-11) propellant tank diaphragm materials. Previous work with small monopropellant thrusters (0.5/2N) has found two mechanisms of silica related performance degradation due to catalyst bed poisoning and injector head/feed tube deposition. This paper will discuss the experimental findings of larger thrusters (5/20N) and the development of software to model the mechanisms of this for the European Solar and Heliospheric Observatory (SOHO) program. The mechanisms were found to be complex, and were dependent on duty cycle: overall consumption and its respective burn history: and the propellant tank/thruster combination. Analyses and tests showed deficits in quantative understanding of the phenomena. but also revealed Dossible &/ degradation. This work has been completed solutions: these areas. This paper will discuss all of W * Propulsion engineer, MMS (UK) * * Propulsion engineer, MMS (France) *** Propulsion engineer, ESTEC, Netherlands **** Copyright e 1992 by Matra Marconi Space (UK) Ltd Published by the American Institute of Aeronautics and Astronaurics, Inc. with permission. Thc Views expressed in this paper may not be those of ESA Propulsion manager, ERNO, a division of MBBPASA Gemany w Introduction Performance degradation of monopropellant thrusters due to silica deposition has been well documented in both Europe and America. pioneered much of the study into this problem. Various tests have been completed [long term tests LTT) to investigate both the source of silica and its effect on monopropellant thrusters. The problem was quickly isolated to satellite propulsion systems which used elastomeric diaphragm [AFE 332) tanks. It was found that silica was being extracted from the elastomeric diaphragm to form a complex silica compound. Silica is used as a filler material in the manufacture of the elastomeric diaphragms. Hydrazine was then fired in the thruster causing the silica compound to break down and poison the catalvst. Other Non Volatile Residues ERNO in Germany have (NVR)*are inrroduced by the propellant, but only silica was found to deposit under the test conditions. The poisoning inhibited thruster performance by producing a larger catalyst bed pressure drop and reducing the area of active catalyst. a further mechanism of silica related degradation could be occurring. postulated that certain pulse modulation schemes caused silica to be deposited in the thruster feed tube and injector head. If the thruster was sufficiently hot, and the off time was sufficiently long, it was found that hydrazine evaporated in the aforementioned area leaving a silica deposit. After a period of time this deposit accumulated and hence caused a decrease in mass flowrate, this consequently causing a loss of thrust. Similar tests have been performed in Americas. The previous reference details some of the work, and recalls a thruster test series which failed. A post test analysis revealed deposits of silicon and aluminium in both the injector and the catalyst bed, which are believed to have caused the problem. More detailed American data is not available and so this paper will solely discuss efforts within the SOHO program to understand and counteract the problem. Additional test firings suggested that" @default.
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• W2024649314 date "1992-07-06" @default.
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• W2024649314 title "Modelling and verification of monopropellant thruster performance degradation due to silica contamination" @default.
• W2024649314 doi "https://doi.org/10.2514/6.1992-3802" @default.
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