Extended-POD based acoustic analysis of separated aerofoils via simultaneous time-resolved PIV and force measurements

Abstract

We present a cross-correlation based analysis of the acoustic field generated in the wake of NACA 0012 and NACA 65410 aerofoils at a chord-based Reynolds number Re_c = 75000 as obtained from pressure fields reconstructed from a series of planar time-resolved Particle Image Velocimetry (PIV) experiments. The experiments are performed in a water channel facility located at the University of Southampton with an overhead carriage system to allow precise control of the angle of attack α of the aerofoils as well as to mount them to a six-axis force/torque transducer to allow for simultaneous load measurements. Angles of attack in the range 4^◦ < α < 17^◦ are explored corresponding to a range of conditions from zero flow separation to fully stalled.