NONINTERFERENCE VELOCITY MEASUREMENTS IN A SUPERSONIC SEEDED PLASMA USING TRACERS PRODUCED BY A SPARK DISCHARGE AND A FOCUSED PULSED LASER
Abstract
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 Btu/lb. Velocities were measured up to 2600 m/sec. The techniques used are described, and the problems and results are discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1968
- Accession Number
- AD0678521
Entities
People
- J. C. Pigott
- L. E. Rittenhouse
Organizations
- Arnold Engineering Development Complex