NONINTERFERENCE VELOCITY MEASUREMENTS IN A SUPERSONIC SEEDED PLASMA USING TRACERS PRODUCED BY A SPARK DISCHARGE AND A FOCUSED PULSED LASER
Final rept. Nov 1966-Jul 1968
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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Experimental results are presented from a program conducted to develop a noninterference method for obtaining the velocity of a supersonic, high enthalpy plasma seeded with an alkali metal. The technique used was the time-of-flight measurement of a tracer spark produced in the plasma by an electric spark discharge two pointed electrodes and by a focused pulse laser. The tracer spark was photographed with a streak and framing camera or an image- converter camera at preselected delay times to obtain the time-of-flight velocity measurements. The experimental work was accomplished in air and nitrogen plasmas, at a static pressure of about 1 atm and at total enthalpies up to 2700 Btulb. Velocities were measured up to 2600 msec. The techniques used are described, and the problems and results are discussed.
- Lasers and Masers
- Fluid Mechanics
- Plasma Physics and Magnetohydrodynamics