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Planar Rayleigh scattering results in helium–air mixing experiments in a Mach-6 wind tunnel

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Abstract

Planar Rayleigh scattering measurements with an argon–fluoride excimer laser are performed to investigate helium mixing into air at supersonic speeds. The capability of the Rayleigh scattering technique for flow visualization of a turbulent environment is demonstrated in a large-scale, Mach-6 facility. The detection limit obtained with the present setup indicates that planar, quantitative measurements of density can be made over a large cross-sectional area (5 cm × 10 cm) of the flow field in the absence of clusters.

© 1992 Optical Society of America

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