Rayleigh and Raman scattering measurements have been performed in the 20-in., Mach 6 wind tunnel at the NASA Langley Research Center. Rayleigh results show signal levels much higher than expected for molecular scattering in the tunnel, whereas densities deduced from spontaneous Raman scattering of molecular nitrogen are in good agreement with the expected nitrogen densities in the facility. The apparent discrepancy in the Rayleigh result is attributed to cluster formation as a result of expansion in the tunnel. The dependence of the Rayleigh signal on the stagnation pressure and temperature is also discussed.


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    Title :

    Condensation effects on Rayleigh scattering measurements in a supersonic wind tunnel


    Contributors:

    Published in:

    Publication date :

    1991-02-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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