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Optica Publishing Group
  • International Quantum Electronics Conference
  • 1996 OSA Technical Digest Series (Optica Publishing Group, 1996),
  • paper MK3

Comparison of experimental and calculated laser-induced fluorescence images in high enthalpy flows

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Abstract

Planar laser-induced fluorescence (PLIF) imaging of nitric oxide (NO) is performed for a symmetrical wedge placed within a hypervelocity jet. The flow contains significant concentrations of species that contribute to the collisional quenching of the NO fluorescence. An attached shock at the tip of the wedge elevates the pressure and temperature to conditions where quenching rates are increased considerably. The flow downstream of this shock is perturbed by an expansion fan emanating from the shoulder of the wedge, which reduces the temperature and pressure, producing a non-uniform region, in which collisional rates decrease significantly. The pressure and temperature are: 7.5 kPa and 300 K in the jet, 200 kPa and 1760 K behind the shock, and 18 kPa and 890 K behind the expansion fan, respectively.

© 1996 Optical Society of America

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