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Sökning: WFRF:(Johansson Pelle) > (2010-2014)

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  • Janhunen, Pekka, et al. (författare)
  • Electric Solar Wind Sail in tailwind
  • 2011
  • Ingår i: EPSC-DPS Joint Meeting 2011.
  • Konferensbidrag (refereegranskat)abstract
    • The Electric Solar Wind Sail (E-sail) is a novelpropulsion concept that enables faster space travel tomany solar system targets. E-sail uses charged solarwind particles as the source of its propulsion. This isachieved by deploying long, conducting and chargedtethers, which get pushed by the solar wind byCoulomb drag [1].E-sail technology is being developed to technicalreadiness level (TRL) 4-5 by the European Union’sSeventh Framework Programme for Research andTechnological Development, EU FP7, in a projectnamed ESAIL (http://www.electric-sailing.fi/fp7).Prototypes of the key parts are to be produced. Thedesign will be scalable so that a real solar winddemonstration mission could be scaled up from them.We review here the latest results of the constantlyevolving E-sail project.
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  • Lekholm, Ville, 1976-, et al. (författare)
  • Verifying microexhausts with schlieren imaging
  • 2010
  • Ingår i: Proceedings of the 2nd International Conference on Space Propulsion, San Sebastián, Spain, May 3-6, 2010.
  • Konferensbidrag (refereegranskat)abstract
    • Schlieren imaging is a method to visualize differences in refractive index within a medium. It is an inexpensive, yet powerful and straightforward tool, for sensitive and high-resolution visualization of gas flows. Here, heated cold gas microthrusters were studied with schlieren imaging techniques. The thruster chips are manufactured using MEMS technology, and measure 22*22*0.85 mm. The nozzles are approximately 20 µm wide at the throat, and 350 µm wide at the exit. Through these studies, verification and direct visualization of the functionality of the thrusters were possible. At atmospheric pressure, slipping of the exhaust was observed, due to the severe overexpansion of the nozzle. In vacuum, the nozzle was underexpanded, and the flow was seen to be supersonic. There was a measurable change in the exhaust with heaters activated. It was also shown that the method can be used to detect leaks, making it a valuable, quick, safe, and inexpensive aid in quality control of the thrusters.
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  • Resultat 1-6 av 6

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