An overview is given of an effort for the use of CFD analysis to complement design and configuration definition of third generation Lean-Direct Injection combustion concepts (LDI-3) for NASA’s N+3 program. The National Combustion Code (OpenNCC) was used to perform non-reacting and two-phase reacting flow computations for a three-cup, nineteen-element flame tube array with redesigned pilot injectors to improve spray and emissions characteristics when compared to a previous LDI-3 design. All computations were performed with a consistent approach to mesh-generation, spray modeling, ignition and kinetics modeling for a ‘medium-power’ cycle condition. Computational predictions of the aerodynamics of a new pre-filming pilot injector were used to arrive at an optimized aerothermal design that meets effective area and fuel-air mixing criteria. The newly designed pilot injectors were shown to provide considerable improvements in aerodynamic stability, flame-tube pattern factor and NOx emissions, when compared to the original design.


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    Title :

    Pilot Injector Redesign to Reduce N+3 Cycle Emissions for a Gas-Turbine Combustor


    Contributors:

    Conference:

    AIAA Propulsion and Energy Forum ; 2019 ; Indianapolis, IN, United States


    Publication date :

    2019-08-19


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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