Propulsors with boundary layer ingestion (BLI) generate a propulsive force with lower flow power input than conventional engines. This aerodynamic benefit can be traced back to its sources: reductions in jet, surface, and wake dissipation. A framework for BLI analysis is developed based on the power balance method: parametric expressions are derived for the net streamwise force on an aircraft and for the mechanical flow power required, as well as relations for the dissipation components. They illustrate the range of possible comparisons between BLI and non-BLI engine installations, and show how the benefit varies with design choices. Applying the framework to wind tunnel data from powered D8 aircraft model tests, the sources of aerodynamic BLI benefit are quantified for a realistic transport aircraft configuration. With the same propulsors (equal nozzle area) BLI reduces cruise power by 8.2%, of which 5.2% comes from a reduction in jet dissipation, 2.4% from reduced surface dissipation, and 0.6% from reduced wake dissipation. The jet dissipation reduction is equivalent to a 3.4 percentage points increase in propulsive efficiency. If the installations are compared at equal mass flow, the benefit amounts to a 9% lower cruise power.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    Analysis of the Aerodynamic Benefit from Boundary Layer Ingestion for Transport Aircraft


    Beteiligte:
    Uranga, Alejandra (Autor:in) / Drela, Mark (Autor:in) / Hall, David K. (Autor:in) / Greitzer, Edward M. (Autor:in)

    Erschienen in:

    AIAA Journal ; 56 , 11 ; 4271-4281


    Erscheinungsdatum :

    01.11.2018




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Boundary Layer Ingestion Propulsion Benefit for Transport Aircraft

    Hall, David K. / Huang, Arthur C. / Uranga, Alejandra et al. | AIAA | 2017



    Boundary Layer Ingestion Benefit of the D8 Transport Aircraft

    Uranga, Alejandra / Drela, Mark / Greitzer, Edward M. et al. | AIAA | 2017

    Freier Zugriff