High-amplitude combustion instabilities are a destructive and pervasive problem in gas-turbine combustors. Although much research has focused on measuring the characteristics of these instabilities, there are still many remaining questions about the fluid-mechanic mechanisms that drive the flame oscillations. In particular, a variety of complex disturbance mechanisms arise during velocity-coupled instabilities excited by transverse acoustic modes. The resulting disturbance field has two components: the acoustic-velocity fluctuation from both the incident transverse acoustic field and the excited longitudinal field near the nozzle, and the vortical-velocity fluctuations arising from acoustic excitation of hydrodynamic instabilities in the flow. In this research, the relative contribution of these two components had been explored using proper orthogonal decomposition as a methodology for decomposing the velocity-disturbance field. Although proper orthogonal decomposition is successful at decomposing these two components at certain nonreacting conditions, it fails at reacting conditions. These results show the significant interaction of velocity-disturbance modes under reacting conditions and the limitations of the proper-orthogonal-decomposition technique for extracting velocity-decomposition information.


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    Title :

    Disturbance-Field Decomposition in a Transversely Forced Swirl Flow and Flame


    Contributors:

    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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    Emerson, B. / Mondragon, U. / Brown, C. et al. | British Library Conference Proceedings | 2011