Velocity selective flow visualization in a free supersonic nitrogen jet with the resonant Doppler velocimeterThe use of the resonant Doppler velocimeter for flow visualization in a free supersonic nitrogen jet is demonstrated experimentally. In the experiment reported here, room-temperature nitrogen at 12.7 psi expands through a Mach 3.4 converging diverging nozzle into a plenum chamber; small amount of sodium is injected through a heated needle centered 0.5-in. upstream of the nozzle throat. The beam of a single frequency dye laser is expanded into a sheet of light with a cylindrical beam expander and directed counter to the jet to spatially resolve any slice across the core of the flow. By tuning the laser to different frequencies, particular velocity and density fields can be highlighted.
Document ID
19850064985
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Zimmermann, M. (Princeton Univ. NJ, United States)
Cheng, S. (Princeton Univ. NJ, United States)
Miles, R. B. (Princeton University NJ, United States)