Copper atom based measurements of velocity and turbulence in arc jet flowsLaboratory and field measurements were combined with a modeling effort to explore the feasibility of using atomic copper laser-induced fluorescence to measure velocity, turbulence, and temperature in arcjet flows. Both CW and pulsed frequency-doubled dye lasers were used to demonstrate the ability to measure velocity with 10 percent accuracy at rates of 200,000 cm/s in a rarefied flow of Cu atoms seeded in He. The pulsed laser established a threshold energy for power-broadening of the absorption line at 3.5 x 10 to the -8th J/sq cm. Field measurements at the NASA/JSC 10-MW arcjet facility demonstrated the ability to perform these measurements under actual test conditions. The use of this technique to measure freestream temperatures in the flow was examined for the 0.08/cm linewidth laser used in the NASA/JSC effort. Finally, single-shot turbulence measurements at the USAF/AEDC 35-MW H2 arcjet facility were measured with 4 percent accuracy using the laser/absorption line-overlap technique.
Document ID
19910036845
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Marinelli, William J. (Physical Sciences, Inc. Andover, MA, United States)
Kessler, William J. (Physical Sciences, Inc. Andover, MA, United States)
Allen, Mark G. (Physical Sciences, Inc. Andover, MA, United States)
Arepalli, Sivaram (Lockheed Engineering and Sciences Co. Houston, TX, United States)
Scott, Carl D. (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Plasma Physics
Report/Patent Number
AIAA PAPER 91-0358Report Number: AIAA PAPER 91-0358