Print Email Facebook Twitter Aerodynamic interaction effects present in tiltable over-the-wing propeller systems Title Aerodynamic interaction effects present in tiltable over-the-wing propeller systems: A numerical study Author Bölk, Sören (TU Delft Aerospace Engineering) Contributor Veldhuis, Leo (mentor) de Vries, Reynard (graduation committee) Degree granting institution Delft University of Technology Programme Aerospace Engineering Date 2020-02-24 Abstract This thesis studies the aerodynamic interaction effects in an over-the-wing (OTW) propeller system to contribute to the development of OTW propeller systems intending at reducing emissions. Previous research shows that an OTW propeller can affect the pressure distribution of the wing such that lift increases and pressure drag decreases. However, studies on the influence of the blade tip vortices on flow separation on a flap due to their interaction with the wing boundary-layer are missing. The results obtained from unsteady RANS simulations in this thesis show that the blade tip vortices significantly contribute to flow separation by causing an additional adverse pressure gradient. To prevent flow separation, the propeller can be inclined with the flap such that the slipstream increases the momentum in the flap boundary-layer. Furthermore, an increase in propulsive efficiency compared to a decoupled propeller-wing system can be achieved if a reduction in propeller thrust is prevented. To reference this document use: http://resolver.tudelft.nl/uuid:ca303498-be53-4c8b-bd87-a6ee8b2ab724 Part of collection Student theses Document type master thesis Rights © 2020 Sören Bölk Files PDF report.pdf 40.65 MB Close viewer /islandora/object/uuid:ca303498-be53-4c8b-bd87-a6ee8b2ab724/datastream/OBJ/view