The intent of this publication is to provide an overview of the progress of the ISP1 project over the 2010-2011 period. In the frame of the European FP7, the In-Space Propulsion (1SP-1) project was initiated in 2009 with the objective of improving the knowledge and the techniques which are necessary for future space missions relying on cryogenic propulsion.The 1SP-1 program is structured into five main work packages which deal with various technological issues associated to the development of a Low Thrust Cryogenic Propulsion system. It concentrates on liquid oxygen, liquid hydrogen, and liquid methane propellants. The subject addressed by the work packages are the LOX-methane combustion, the hydrogen embrittlement, the material compatibility and tribology in liquid oxygen, the energy management of low thrust propulsion system, and the development of electrically driven cryogenic turbopumps.The scientific and technological goals assigned to each work package can be summarized as :1. LOX/CH4 Combustion studies and test focused on low thrust LOX/CH4 space propulsion with an emphasis on low pressure liquid injection2. Compatibility and tribology analysis and tests addressing both technological aspects (Foil bearings in cryogenic conditions , material for bearing retainer, graphite against a hard surface for dynamic seals) and more fundamental aspects (feasibility of CH4 tribological tests, theoretical analysis of local contact conditions) of tribology.3. Hydrogen embrittlement studies and tests with the objective of testing new materials in a High pressure and medium range temperature environment4. Heat Accumulators studies and tests, focused on energy management techniques, with testing of a low temperature accumulator5. The Propellant Electric Pumps design and tests, to be concluded by the testing of a demonstrator pump in LN2 The work packages of project ISP1 rely on a combination of analysis and test, of theoretical activities which can serve as a basis for PhD thesis or more application oriented activities such as the design and testing of a demonstrator pump or a demonstrator accumulator.These work packages are focused on technologies which are considered as the critical points of future cryogenic space propulsion systems. By increasing the technological readiness level of these technologies, these activities pave the way for the development of future propulsion systems and constitute an asset with respect to possible future international cooperation.
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