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Communication Dans Un Congrès Année : 2021

Laminar to turbulent transition over a rotor at low Reynolds numbers

Résumé

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.
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Dates et versions

hal-03206262 , version 1 (23-04-2021)

Identifiants

  • HAL Id : hal-03206262 , version 1

Citer

Thomas Jaroslawski, Maxime Forte, Gregory Delattre, Erwin Ricky Gowree, Jean-Marc Moschetta. Laminar to turbulent transition over a rotor at low Reynolds numbers. Aero 2020+1 - 55th 3AF International Conference on Applied Aerodynamics, Mar 2020, Poitiers (Online), France. pp.FP94-2020-jaroslawski. ⟨hal-03206262⟩

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