Dual-pump coherent anti-Stokes Raman spectroscopy (CARS) was used to measure the mole fractions of major species as well as the rotational and vibrational temperatures of molecular nitrogen in a hydrogen-fueled dual-mode scramjet flowpath operated in the “ram” mode. Developments in CARS methods and uncertainties are described, including a detailed analysis of the effects of spatial averaging. The mean and standard deviation of the turbulent fluctuations of the temperature and mole fractions at multiple planes in the flowpath and scatter plots of vibrational and rotational temperature are presented. The flame is stabilized downstream of the ramp and grows under the influence of turbulence and rollup of the counterrotating vortex pair formed at the ramp; combustion continues in accelerating flow approaching the end of the measurement domain. Thermal nonequilibrium is observed in the mixing of air with the molecular hydrogen jet close to the injector. Spatial averaging errors are significant at some locations; new methods to correct these errors are described.


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    Titel :

    Coherent Anti-Stokes Raman Spectroscopy of a Hydrogen Diffusion Flame in a Ramjet


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 57 , 1 ; 313-326


    Erscheinungsdatum :

    2018-12-10


    Format / Umfang :

    14 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Flame studies with the coherent anti-Stokes Raman spectroscopy technique

    GOSS, L. / SWITZER, G. / SCHREIBER, P. | AIAA | 1980


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    L.P. Goss / G.L. Switzer / P.W. Schreiber | AIAA | 1983


    Flame investigation by coherent anti-Stokes Raman scattering

    MOYA, F. / DRUET, S. / PEALAT, M. et al. | AIAA | 1976