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Gas-phase velocimetry by nearly degenerate four-wave mixing

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Abstract

We demonstrate a new velocimetry technique for gas flows based on Nearly Degenerate Four-Wave Mixing (NDFWM). Measurements were performed on nitric oxide in a free-jet expansion using helium and argon as carrier gases, at flow velocities on the order of 1000 m/s. We obtained velocities by analyzing experimental spectra from the jet using a perturbative treatment of NDFWM that we extended to include an arbitrary bulk velocity. The results agreed with independent velocity measurements based on Laser-Induced Fluorescence (LIF), as well as with theoretical flow-field velocities, to better than 5% in all cases studied.

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Authors and Affiliations

  1. High Temperature Gasdynamics Laboratory, Stanford University, 94305-3032, Stanford, CA, USA

    P. M. Danehy

  2. Combustion Research Facility, Sandia National Laboratories, 94551-0969, Livermore, CA, USA

    R. L. Farrow

Authors
  1. P. M. Danehy
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  2. R. L. Farrow
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Danehy, P.M., Farrow, R.L. Gas-phase velocimetry by nearly degenerate four-wave mixing. Appl. Phys. B 62, 407–413 (1996). https://doi.org/10.1007/BF01081203

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  • DOI: https://doi.org/10.1007/BF01081203

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