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

Sumit Tambe; Ferdinand Schrijer; Arvind Gangoli Rao; Leo Veldhuis

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

Sumit Tambe, Ferdinand Schrijer, Arvind Gangoli Rao, Leo Veldhuis

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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.

Original language	English
Title of host publication	54th 3AF International Conference AERO2019 At: Paris, France
Number of pages	8
Publication status	Published - 27 Mar 2019
Event	54th 3AF International Conference on Applied Aerodynamics - Paris, France Duration: 25 Mar 2019 → 27 Mar 2019 Conference number: 54 http://3af-aerodynamics2019.com/

Conference

Conference	54th 3AF International Conference on Applied Aerodynamics
Abbreviated title	AERO 2019
Country/Territory	France
City	Paris
Period	25/03/19 → 27/03/19
Internet address	http://3af-aerodynamics2019.com/

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AERO2019_45_S. TAMBE_PAccepted author manuscript, 1.25 MBLicence: Unspecified

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@inproceedings{13ac005ce8c340eb96fd69972df4ec70,

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

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.",

author = "Sumit Tambe and Ferdinand Schrijer and {Gangoli Rao}, Arvind and Leo Veldhuis",

year = "2019",

month = mar,

day = "27",

language = "English",

booktitle = "54th 3AF International Conference AERO2019 At: Paris, France",

note = "54th 3AF International Conference on Applied Aerodynamics, AERO 2019 ; Conference date: 25-03-2019 Through 27-03-2019",

url = "http://3af-aerodynamics2019.com/",

}

TY - GEN

T1 - Coherent vortex structures over a rotating spinner under non-axial inflows at low Reynolds number

AU - Tambe, Sumit

AU - Schrijer, Ferdinand

AU - Gangoli Rao, Arvind

AU - Veldhuis, Leo

N1 - Conference code: 54

PY - 2019/3/27

Y1 - 2019/3/27

N2 - 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.

AB - 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.

M3 - Conference contribution

BT - 54th 3AF International Conference AERO2019 At: Paris, France

T2 - 54th 3AF International Conference on Applied Aerodynamics

Y2 - 25 March 2019 through 27 March 2019

ER -

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

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