The mechanics of flow-induced noise production from a finite span airfoil Seminar

The flow-induced noise produced by a surface-mounted, finite span airfoil (or wing) is important for many aerodynamic and hydrodynamic applications. Examples include wing-fuselage junctions, turbomachinery blade, rotor tip and end-wall flows, and ship appendage and hull-junction flows.

This presentation provides an overview of the airfoil noise program at UNSW Sydney. In general, there are four flow regimes for a surface-mounted, finite airfoil. These are

• the airfoil-wall junction flow featuring a horseshoe vortex that wraps around the airfoil base;
• turbulent flow interaction with the leading edge;
• trailing edge flow whose structure depends upon the Reynolds number;
• and the tip flow that consists of vortices that form as the flow wraps around the free-end of the airfoil.

The acoustic signature and turbulent noise sources associated with each of these flow regimes will be examined using anechoic wind tunnel measurements obtained with acoustic array, unsteady surface pressure and turbulence measurement methods.

 

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Speaker: Dr Danielle Moreau, UNSW Sydney

Danielle Moreau obtained her PhD from the University of Adelaide in 2010. Following PhD completion, she worked as a research associate at the University of Adelaide for five years where she investigated the mechanics of bio-inspired quiet airfoils and submarine hydrofoil noise generation. In 2015, Danielle moved to UNSW Sydney where she currently holds the position of senior lecturer. Her research focuses on the understanding and control of flow-induced noise with the aim of quietening modern technologies. Her major research contributions have been in (i) wall-mounted finite airfoil aeroacoustics, (ii) airfoil trailing edge noise production and control, (iii) rotor, fan and wind turbine noise generation and (iv) bluff body flow noise.