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Session: Complex and rotating flows
Session starts: Wednesday 05 November, 11:40
Presentation starts: 11:40
Room: Commission roon 2

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Gabriele Salomone (University of Naples "Federico II")
Gerardo Paolillo (University of Naples "Federico II")
Tommaso Astarita (University of Naples "Federico II")
Gennaro Cardone (University of Naples "Federico II")
Carlo Salvatore Greco (University of Naples "Federico II")

Abstract:
Characterizing the flow field around propellers operating at low Reynolds numbers is important for design optimization, since the presence of phenomena, such as laminar separation bubbles (LSBs), can negatively impact propeller performance, leading to noise emissions, stall and drag penalties. The present work uses Infrared Thermography (IRT) to examine the relevant features of the flow field surrounding a 610 mm-diameter propeller that mounts a NACA 4412 airfoil throughout the span. The propeller is operated at rotational velocity equal to 130 rad/s, corresponding to tip chord-based Reynolds number equal to 4.13 × 10^4. Preliminary results highlight the presence of a laminar separation bubble in the tip region and larger separation regions towards the root.