Browsing by Author "Hart, Pierce L."

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    Thrust/drag decomposition using partial pressure fields
    (Association Aeronautique et Astronautique de France (3AF), 2023-03-31) Hart, Pierce L.; Mutangara, Ngonidzashe E.; Sanders, Drewan S.; Schmitz, Sven
    The accurate prediction of aircraft performance requires a robust definition of thrust/drag accounting. Traditional nacelle-pylon configurations have been treated as separate entities which are combined linearly; however, this is not feasible for embedded propulsion systems which have a higher degree of interaction than traditional designs. With the apparent shift to embedded propulsion systems in the N+3 generation of aircraft, of which boundary layer ingestion technology is a driving factor, improving our understanding of propulsion system interactions with an air-frame has never been more important. Since many of these interactions occur close to the body, a near-field decomposition method, partial pressure fields, is employed in CFD to provide insight as to the interactive aerodynamics of an embedded propulsion system.
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    A unified partial pressure field and velocity decomposition approach toward improved energetic aerodynamic force decompositions
    (Association Aeronautique et Astronautique de France (3AF), 2023-03-31) Mutangara, Ngonidzashe E.; Sanders, Drewan S.; Laskaridis, Panagiotis; Hart, Pierce L.; Schmitz, Sven
    Drag decomposition through energy and exergy-based methods has been shown to have a variety of advantages. One of these is identifying and quantifying the recoverable energy within a flow field. This describes the available energy that can be used to produce thrust through systems such as boundary layer ingestion. Another advantage highlighted from prior work is that the velocity decomposition approach can split the flow field into its isentropic and non-isentropic contributions. This provides region-specific formulations for drag assessment, wherein the isentropic field is associated with contributions originating from the bulk flow and the non-isentropic field with the shear layer. This paper aims to assess the performance of a modified form of the velocity decomposition approach for transonic flows. This modification involves unification with partial pressure field analysis, which provides better flow field separability due to the added decomposition of the pressure field.