In ultra-compact combustors, the length of the system is reduced by integrating the turbine turning vanes within the combustor and the primary zone is in a cavity recessed from the core flow. To understand the combustion characteristics of an ultra-compact combustor, the turning vanes were removed and a combined-diffuser flameholder was integrated upstream of a trapped-vortex combustor cavity. Two variants of the combined-diffuser flameholder are compared. In configuration A , the row of passages nearest the trapped-vortex combustor is opened, whereas for configuration B , an additional row of flow passages vertically adjacent is also open. Grid-independent three-dimensional simulations of these geometries are performed following a steady, multiphase, Reynolds-averaged Navier–Stokes, C -progress variable/flamelet approach with source terms to model effusion cooling. Nondispersive infrared analyzers were used to measure the concentrations of CO 2 , O 2 , and CO at the exit of the test section using three sets of emission rakes, with each having five vertically aligned, quick quenching sampling probes. Reasonable comparison was obtained between predictions and measurements of CO 2 and O 2 mass fraction profiles. Besides comparison between the two configurations, the effect of combustion on the flowfield/flamelet/flame structure is provided. Recommendations on further improvement of the design and numerical model are also discussed.


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    Titel :

    Reacting Flows in Ultra-Compact Combustors with Combined-Diffuser Flameholder


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2014-08-14


    Format / Umfang :

    15 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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