Other
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.563..515z&link_type=abstract
Proceedings of the Fifth European Symposium on Aerothermodynamics for Space Vehicles (ESA SP-563). 8-11 November 2004, Cologne,
Other
Scientific paper
The von Karman Institute (VKI) has initiated an investigation of Magneto Fluid Dynamic (MFD) acceleration of a subsonic inductively coupled plasma (ICP) flow to broaden the knowledge of MFD device operation in different flow regimes for possible future utilization. Experimental evaluation of ICP was completed using an intrusive double electrostatic probe to determine spatially resolved electron number densities and electron temperature of nitrogen plasma at two absorbed plasma powers. The electrical conductivity for N2 at 16 mbar static pressure was determined to be 1.5 W-1 m-1 . This is sufficient enough electrical conductivity to continue the subsystem design and validation based upon the one-dimensional MFD equations. The most favorable Voltage-Current (VI) characteristics occurred with the Hall geometry orientation. Less than 23% of argon by mass also yielded an even more favorable V-I characteristics for future MFD accelerators. As pressure increased the gas resistive increased and gave results consistent with Paschen's Law. The measured Boltzmann temperature near the surface of the cathode was between 800 and 1500 Kelvin. The measured electron number density was increased at least an order of magnitude (from 1017 to 1019 electrons/m3 ) at and between the anode and cathode during discharge during DC discharge.
Fletcher Douglas G.
Playez Mickaël
Zuber Matthew E.
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