A molecular Rayleigh scattering technique is developed to measure gas velocity, temperature, and density in unseeded gas flows at sampling rates up to 32 kHz. A high-power continuous-wave laser beam is focused at a point in an air flowfleld, and Rayleigh scattered light is collected and fiber-optically transmitted to a Fabry-Perot interferometer for spectral analysis. Photomultiplier tubes operated in the photon-counting mode allow highfrequency sampling ofthe total signal level and the circular interference pattern to provide density, temperature, and velocity measurements. Mean and root-mean-square fluctuation measurements in both an electrically heated jet facility with a 10-mm-diam nozzle and in a hydrogen-combustor-heated-jet facility with a 50.8-mm-diam nozzle at NASA John H. Glenn Research Center at Lewis Field are presented. Measurements are compared with hot-wire anemometry, cold-wire thermometry, and temporally resolved particle image velocimetry to validate the Rayleigh technique.


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    Title :

    Multiproperty measurements at high sampling rates using Rayleigh scattering


    Additional title:

    Messung mehrerer Eigenschaften mit hoher Abtastfrequenz mit Hilfe der Rayleigh-Streuung


    Contributors:

    Published in:

    AIAA Journal ; 47 , 4 ; 850-862


    Publication date :

    2009


    Size :

    13 Seiten, 23 Bilder, 34 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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