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.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

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


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2017-02-10


    Format / Umfang :

    12 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Effect of Excitation Amplitude on Disturbance Field of a Transversely Forced Swirl Flow and Flame (AIAA 2014-0658)

    O Connor, J.A. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2014



    DYNAMICS OF A TRANSVERSELY FORCED, BLUFF BODY STABILIZED FLAME

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