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Characterisation of boundary layer transition over a low Reynolds number rotor

Jaroslawski, Thomas and Forte, Maxime and Moschetta, Jean-Marc and Delattre, Gregory and Gowree, Erwin Ricky Characterisation of boundary layer transition over a low Reynolds number rotor. (2022) Experimental Thermal and Fluid Science, 130. 110485. ISSN 0894-1777

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Official URL: https://doi.org/10.1016/j.expthermflusci.2021.110485

Abstract

An experimental investigation on the flow topology over a rotor operating atlow Reynolds numbers is presented. The feasibility of laminar to turbulenttransition experiments over small rotors is demonstrated. Phase-locked infraredthermography coupled with simultaneous force and torque measurements wereused to study a three bladed rotor with a NACA0012 aerofoil section set at auniform angle of incidence of 10◦. Boundary layer transition was forced usingtwo-dimensional (2D) and three-dimensional (3D) roughness elements, placedat approximately 5% and 28% of the rotor blades chord. In the 3D roughnessconfigurations once the critical roughness Reynolds was attained the streaksdownstream developed into fully turbulent wedges. For the current rotor con-figuration, it was found that the state of the boundary layer can significantlyaffect its performance, with the non-optimal forcing of laminar to turbulenttransition generally resulting in a loss of performance when compared to thesmooth reference rotor case.Keywords:Infrared Thermography; Boundary layer transition; Low Reynoldsnumber; rotor

Item Type:Article
HAL Id:hal-03340224
Audience (journal):International peer-reviewed journal
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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Deposited On:24 Aug 2021 08:58

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