AbstractCavity has been validated to be efficient flameholders for scramjet combustors, but the influence of its parameters on the combustion oscillation in scramjet combustor has barely been studied. In the present work, a series of experiments focusing on this issue have been carried out. The influence of flameholding cavity position, its length to depth ratio L/D and aft wall angle θ and number on ethylene combustion oscillation characteristics in scramjet combustor has been researched. The obtained experimental results show that, as the premixing distance between ethylene injector and flameholding cavity varies, the ethylene combustion flame will take on two distinct forms, small-amplitude high frequency fluctuation, and large-amplitude low frequency oscillation. The dominant frequency of the large-amplitude combustion oscillation is in inverse proportion to the pre-mixing distance. Moreover, the influence of cavity length to depth ratio and the aft wall angleθexists diversity when the flameholding cavity position is different and can be recognized as unnoticeable compared to the impact of the premixing distance. In addition, we also find that, when the premixing distance is identical and sufficient, increasing the number of tandem flameholding cavities can change the dominant frequency of combustion oscillation hardly, let alone avoid the combustion oscillation. It is believed that the present investigation will provide a useful reference for the design of the scramjet combustor.

    HighlightsThe pre-mixing has the most significant influence on the combustion process.The flame can behave as high frequency fluctuation, or low frequency oscillation.The frequency of oscillation is in inverse proportion to the pre-mixing distance.The influence of L/D and θ, will be different as the pre-mixing distance varies.The oscillation cannot be avoided by increasing the amount of tandem cavity.


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    Titel :

    The influence of cavity parameters on the combustion oscillation in a single-side expansion scramjet combustor


    Beteiligte:
    Ouyang, Hao (Autor:in) / Liu, Weidong (Autor:in) / Sun, Mingbo (Autor:in)

    Erschienen in:

    Acta Astronautica ; 137 ; 52-59


    Erscheinungsdatum :

    2017-03-22


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch