Print Email Facebook Twitter Instability of Rotating-Cone Boundary Layer in Axial Inflow Title Instability of Rotating-Cone Boundary Layer in Axial Inflow: Effect of Cone Angle Author Tambe, S.S. (TU Delft Flight Performance and Propulsion) Schrijer, F.F.J. (TU Delft Aerodynamics) Gangoli Rao, A. (TU Delft Flight Performance and Propulsion) Veldhuis, L.L.M. (TU Delft Flow Physics and Technology) Department Flow Physics and Technology Date 2023 Abstract Boundary-layer instability on a rotating cone induces coherent spiral vortices that are linked to the onset of laminar–turbulent transition. This type of transition is relevant to several aerospace systems with rotating components, e.g., aeroengine nose cones. Because a variety of options exist for the nose-cone shapes, it is important to know how their shape affects the boundary-layer transition phenomena. This study investigates the effect of varying cone angle on the boundary-layer instability on rotating cones facing axial inflow. It is found that increasing cone angle has a stabilizing effect on the boundary layer over rotating cones in axial inflow. The parameter space of Reynolds number Re l and local rotational speed ratio S is experimentally explored to find the spiral vortex growth on rotating cones of half angle ψ 22.5°, 45°, and 50°. The previously addressed cases of ψ 15° and 30° are also revisited. Increasing half-cone angle is found to have a stabilizing effect on the boundary layer on the rotating cones with ψ ≲ 45°; i.e., the spiral vortex growth is delayed to higher Re l and S. This effect diminishes when the half-cone angle increases from ψ 45° to 50°. The spiral vortex angle ϵ decreases with increasing rotational speed ratio S for all the investigated cones, irrespective of the half-cone angle. However, the instability on the broader cones is found to induce shorter azimuthal wavelengths. To reference this document use: http://resolver.tudelft.nl/uuid:99882db2-9557-4f9f-8e24-961fc0b7db2c DOI https://doi.org/10.2514/1.J062737 ISSN 0001-1452 Source AIAA Journal: devoted to aerospace research and development, 61 (8), 3326-3336 Part of collection Institutional Repository Document type journal article Rights © 2023 S.S. Tambe, F.F.J. Schrijer, A. Gangoli Rao, L.L.M. Veldhuis Files PDF 1.j062737.pdf 3.54 MB Close viewer /islandora/object/uuid:99882db2-9557-4f9f-8e24-961fc0b7db2c/datastream/OBJ/view