Coherent vortex structures over a rotating spinner under non-axial inflows at low Reynolds number

Conference paper (2019)

Authors

S.S. Tambe Flight Performance and Propulsion - Aerospace Engineering
F.F.J. Schrijer Aerodynamics - Aerospace Engineering
A. Gangoli Rao Flight Performance and Propulsion - Aerospace Engineering
L.L.M. Veldhuis Flight Performance and Propulsion - Aerospace Engineering
Research Group
Flight Performance and Propulsion (Aerospace Engineering) (TU Delft)
Copyright: © 2019 S.S. Tambe, F.F.J. Schrijer, A. Gangoli Rao, L.L.M. Veldhuis
More Info
expand_more

Published Date

27-03-2019

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Aerospace Engineering

Department

Flow Physics and Technology

Research Group

Flight Performance and Propulsion

Abstract

Boundary layer instabilities and the formation of coherent spiral vortices over a rotating cone and ellipsoid are studied experimentally. It is found that under a non-axial inflow, the breaking of symmetry in the flow field significantly disturbs the coherence and delays the formation of spiral vortices to higher local Reynolds numbers (Re_l) and higher rotation ratios (S). Consequently, it also delays boundary layer transition region. A conceptual reasoning for the observed phenomena is given based on the sensitivity of the local spiral vortex characteristics (number n and angle ϵ) to the asymmetry in the local rotation ratios.