Flow visualization using fluorescence from locally seeded I2 excited by an ArF excimer laser |
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Authors: | R J Exton R J Balla B Shirinzadeh M E Hillard G J Brauckmann |
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Institution: | (1) Measurement Science and Technology Branch, M/S 493 NASA Langley Research Center Hampton, VA 23681-2199 USA, US;(2) Aerothermodynamics Branch, M/S 408A NASA Langley Research Center Hampton, VA 23681-2199 USA, US |
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Abstract: | A new concept for flow visualization is demonstrated in which fluorescence from locally seeded iodine is viewed in the wake
of simple aerodynamic models at Mach 6. Localized seeding is performed by painting a small area of a ceramic model with a
tincture of iodine. When the model is injected into the flow, the adsorbed iodine is entrained into the boundary layer, follows
the model contour, and ultimately mixes into the wake region. Planar “snapshots” of the wake flow are taken by exciting the
iodine with an ArF excimer laser sheet at 193 nm and observing the fluorescence in the 210–600 nm region with an intensified
CCD camera.
Received: 17 July 1997/Accepted: 12 August 1998 |
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