Combustion instabilities arise from interactions between the acoustic field and unsteady heat release within a confined chamber. In the present study, a three-dimensional acoustic model is developed to explore the effect of azimuthally nonuniform distribution of heat release on longitudinal combustion instabilities. The governing equations are solved by means of a spectral collocation method with domain decomposition to accommodate the flow discontinuities across the flame. It is shown that the circumferential nonuniformity in heat release has only a marginal effect on instability frequency but may cause a potentially significant decrease in the growth rate. For some combinations of flow parameters, a high degree of heat-release asymmetry may qualitatively change the stability characteristics of the combustor, with a sign change of the growth rate. It is found that vorticity waves produced by the azimuthally nonuniform heat release may contribute damping to the thermoacoustic system.


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    Title :

    Effect of Azimuthally Nonuniform Heat Release on Longitudinal Combustion Instabilities



    Published in:

    Publication date :

    2017




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.50 Luftfahrzeugtechnik / 55.50
    Local classification TIB:    770/7040




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