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Journal Articles Experimental Thermal and Fluid Science Year : 2022

Characterisation of boundary layer transition over a low Reynolds number rotor

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.

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hal-03340224 , version 1 (10-09-2021)

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Thomas Jaroslawski, Maxime Forte, Jean-Marc Moschetta, Gregory Delattre, Erwin Ricky Gowree. Characterisation of boundary layer transition over a low Reynolds number rotor. Experimental Thermal and Fluid Science, 2022, 130, pp.110485. ⟨10.1016/j.expthermflusci.2021.110485⟩. ⟨hal-03340224⟩

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