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Title: Plasma parameters and electromagnetic forces induced by the magneto hydro dynamic interaction in a hypersonic argon flow experiment

This work proposes an experimental analysis on the magneto hydro dynamic (MHD) interaction induced by a magnetic test body immersed into a hypersonic argon flow. The characteristic plasma parameters are measured. They are related to the voltages arising in the Hall direction and to the variation of the fluid dynamic properties induced by the interaction. The tests have been performed in a hypersonic wind tunnel at Mach 6 and Mach 15. The plasma parameters are measured in the stagnation region in front of the nozzle of the wind tunnel and in the free stream region at the nozzle exit. The test body has a conical shape with the cone axis in the gas flow direction and the cone vertex against the flow. It is placed at the nozzle exit and is equipped with three permanent magnets. In the configuration adopted, the Faraday current flows in a closed loop completely immersed into the plasma of the shock layer. The electric field and the pressure variation due to MHD interaction have been measured on the test body walls. Microwave adsorption measurements have been used for the determination of the electron number density and the electron collision frequency. Continuum recombination radiation and linemore » radiation emissions have been detected. The electron temperature has been determined by means of the spectroscopic data by using different methods. The electron number density has been also determined by means of the Stark broadening of H{sub {alpha}} and the H{sub {beta}} lines. Optical imaging has been utilized to visualize the pattern of the electric current distribution in the shock layer around the test body. The experiments show a considerable effect of the electromagnetic forces produced by the MHD interaction acting on the plasma flow around the test body. A comparison of the experimental data with simulation results shows a good agreement.« less
Authors:
; ;  [1]
  1. Department of Electrical Engineering, University of Bologna, Viale Risorgimento 2, 40136 Bologna (Italy)
Publication Date:
OSTI Identifier:
22089370
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 112; Journal Issue: 3; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ADSORPTION; ARGON; COMPARATIVE EVALUATIONS; ELECTRIC FIELDS; ELECTRON COLLISIONS; ELECTRON TEMPERATURE; FARADAY CURRENT; GAS FLOW; HYPERSONIC FLOW; INTERACTIONS; ION TEMPERATURE; LAYERS; LINE BROADENING; MAGNETOHYDRODYNAMICS; MICROWAVE RADIATION; NOZZLES; PERMANENT MAGNETS; PLASMA; PLASMA DENSITY; RECOMBINATION; SHOCK WAVES; STARK EFFECT; STREAMS; WALLS; WIND TUNNELS