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Laminar to turbulent transition over a rotor at low reynolds numbers

Jaroslawski, Thomas and Forte, Maxime and Delattre, Grégory and Gowree, Erwin Ricky and Moschetta, Jean-Marc Laminar to turbulent transition over a rotor at low reynolds numbers. (2021) In: 55th 3AF International Conference on Applied Aerodynamics, 12 April 2021 - 14 April 2021 (Piotiers, France).

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Abstract

An experimental investigation on the flow topology and performance of a rotor operating at low Reynolds numbers is presented. The feasibility of laminar to turbulent transition experiments over small rotors is demonstrated. Phase-locked infrared thermography coupled with simultaneous force and torque measurements were used to study a three bladed NACA0012 rotor with a radius of 0.125 m and an angle of attack of 10 degrees. Boundary layer transition was fostered using two-dimensional (2D) and threedimensional (3D) isolated roughness elements, placed at approximately 5% and 28% of the rotor blades chord. In the smooth rotor configuration, a 3D flow topology is observed, consisting of a clear laminar region closer to the blade root and a turbulent region at the blade tip. It was found that the state of the boundary layer can significantly affect the rotor’s performance, with the forcing of laminar to turbulent transition generally resulting in a loss of performance when compared to the smooth reference rotor case.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
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Funders:
ISAE-SUPAERO
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Deposited On:04 May 2021 09:56

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