An Experimental Evaluation of a Laser Velocimeter by the Study of Turbulence in a Plane Free Jet at High Subsonic Velocities.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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This research was conducted in order to experimentally evaluate the Laser Velocimeter by comparing the results to those obtained by means of a Hot Wire Anemometer. The means used for this evaluation was a 10 x 1 cm free jet exhausting into stationary air. The velocities of interest were in the high subsonic range and all measurements were taken at 25, 50 and 75 cm from the exit plane. The parameters measured or calculated were mean velocities, turbulence intensities, Reynolds Shear Stresses, time microscale, spatial microscale, time integral scale, and spatial integral scale. The results of this research indicate that, although the Laser Velocimeter is an accurate and reliable system, its range of operation is limited in high velocities andor turbulence intensities. It was also found that, as specified, this system not only required no seeding but would also function with a filter installed in the set-up. Author
- Fluid Mechanics