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.
Original languageEnglish
Title of host publication54th 3AF International Conference AERO2019 At: Paris, France
Number of pages8
Publication statusPublished - 27 Mar 2019
Event54th 3AF International Conference on Applied Aerodynamics - Paris, France
Duration: 25 Mar 201927 Mar 2019
Conference number: 54


Conference54th 3AF International Conference on Applied Aerodynamics
Abbreviated titleAERO 2019
Internet address

ID: 52852727