Laminar to turbulent transition over a rotor at low Reynolds numbers
| Autor: | Jaroslawski, Thomas, Forte, Maxime, Delattre, Grégory, Gowree, Erwin Ricky, Moschetta, Jean-Marc |
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| Přispěvatelé: | ONERA / DMPE, Université de Toulouse [Toulouse], PRES Université de Toulouse-ONERA, Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), WIBAUX, Laurine |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
[PHYS]Physics [physics]
[SPI] Engineering Sciences [physics] [PHYS] Physics [physics] Reynolds number Nonlinear Sciences::Chaotic Dynamics Physics::Fluid Dynamics [SPI]Engineering Sciences [physics] Autre Boundary layer transition Laminar turbulent transition Rotor Rotors Infrared thermography Physics::Chemical Physics |
| Zdroj: | Aero 2020+1-55th 3AF International Conference on Applied Aerodynamics Aero 2020+1-55th 3AF International Conference on Applied Aerodynamics, Mar 2020, Poitiers (Online), France. pp.FP94-2020-jaroslawski |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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