The effect of density ratio, velocity ratio, momentum ratio, and fuel composition on the susceptibility of shear coaxial flames to periodic pressure waves is studied experimentally. A GO 2 - GH 2 turbulent diffusion flame, established in an atmospheric-pressure, two-dimensional, shear coaxial combustor, is acoustically forced by a transversely mounted compression driver, and the level of flame acoustic interaction is quantified using OH * chemiluminescence imaging. The parameter of interest is varied by diluting the propellants with helium, argon, or methane by appropriate amounts while holding other parameters relatively constant. Flame response is found to vary exponentially with density ratio, whereas it is found to vary linearly with velocity ratio and fuel composition, at least within the limited ranges tested. Flame response is found to vary exponentially when momentum ratio is varied by varying density ratio, whereas it is found to vary linearly when momentum ratio is varied by varying velocity ratio. Overall, our results support the notions that propellant density ratio is a critical parameter affecting shear coaxial flame–acoustic interactions and that a reduction in propellant density ratio could improve the stability of combustors using such injectors.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effect of Flow Parameters on the Acoustic Susceptibility of Shear-Coaxial Flames


    Contributors:
    Ghosh, A. (author) / Diao, Q. (author) / Yu, K. H. (author)

    Published in:

    Publication date :

    2016-03-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    Experimental Investigation of Shear Coaxial Cryogenic Jet Flames

    Candel, S. / Herding, G. / Snyder, R. et al. | British Library Conference Proceedings | 1998


    Experimental Investigation of Shear Coaxial Cryogenic Jet Flames

    S. Candel / G. Herding / R. Synder et al. | AIAA | 1998