Computer Science
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.533...47m&link_type=abstract
In: Proceedings of the First International Workshop on Radiation of High Temperature Gases in Atmospheric Entry, 8-10 October 20
Computer Science
2
Sr5, Plasma, Supersonic Flow, Interferometry, Lif
Scientific paper
The flow properties of a low-pressure weakly ionized supersonic argon plasma jet produced in the SR5 wind-tunnel are examined using Fabry-Pérot interferometry and Laser Induced Fluorescence spectroscopy. As expected, the plasma flow is found to be supersonic inside the divergent part of the arcjet nozzle. At the exhaust, the velocity reaches 4.5 km s-1 and the Mach number M is equal to 3.9. Surprisingly, the axial flow velocity measured along the jet centerline decreases down to about 3 km s-1 ahead of the stationary compression wave where M = 4.8. The on-axis velocity profile reveals the existence of several expansion cells that find their origin in the regular reflection phenomenon, i.e. no Mach disk is formed. Hence, the supersonic to subsonic transition occurs far downstream. At the nozzle outlet, the parallel temperature is not in equilibrium with the perpendicular temperature: T∥ ≍ 4000K whereas T⊥ = 1800K. The parallel temperature rises up to 5000K in the shock region. Beyond the shock front both temperatures are in equilibrium: T ≍ 3000K.
Caubet-Hilloutou V.
Dudeck Michel
Mazouffre Stephane
Pawelec E.
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