MEASUREMENT OF GAS VELOCITY IN A PLASMA WIND TUNNEL USING an electron beam probe

MEASUREMENT OF GAS VELOCITY IN A PLASMA WIND TUNNEL USING an electron beam probe

An electron beam probe was installed in a 8000-kilowatt plasma facility. Difficulty in applying the electron beam probe to measurements of gas density, etc., was found to be due to the weak plasma arc generated magnetic fields producing positional displacements of the beam. These problems were solve...

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Bibliographische Detailangaben
1. Verfasser: Cason,Charles
Format: Report
Sprache:eng
Schlagworte:
Aerodynamics
ATMOSPHERE ENTRY
ELECTRON BEAMS
Fluid Mechanics
MAGNETIC FIELDS
PLASMA TUNNELS
PLASMAS(PHYSICS)
PROBES
PULSE MODULATION
Test Facilities, Equipment and Methods
VELOCITY
WIND TUNNELS
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Zusammenfassung:An electron beam probe was installed in a 8000-kilowatt plasma facility. Difficulty in applying the electron beam probe to measurements of gas density, etc., was found to be due to the weak plasma arc generated magnetic fields producing positional displacements of the beam. These problems were solved by means of a closed-loop electronic controller. Response time of the controller is down 3 decibels at 130 hertz which was found to be sufficiently fast for adequate control. Attempts to measure gas velocity by measuring drift rates of beam generated plasma cylinders at fixed rates uncovered other problems. Estimates of gas velocity by this method gave 3700 plus or minus 400 meters per second as compared to a machine computed value of 3800 meters per second for air of h/RT sub o = 150. (Author)