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The University of Southampton

A numerical study of aerofoil noise during flow separation and stall Seminar

11 February 2020

Event details

Aerofoil trailing edge turbulent boundary layer scattering has received significant attention since the 1970s. Despite this, it is only considered to be the dominant source of aerofoil self-noise for low angles of attack. In many real engineering applications aerofoils are regularly operated at high angles where they are susceptible to undesirable flow conditions such as separation or stall. This is particularly likely for applications where they are subjected to unsteady inflow conditions, e.g. wind shear encountered by wind turbines. Under such conditions, noise from flow separation could reasonably exceed low angle trailing edge noise by more than 10 dB. Presently little is understood about the mechanisms of separation/stall noise, and consequently how to effectively reduce it.

In this seminar direct numerical simulations of aerofoil stall will be presented for a NACA0012 aerofoil at a low Reynolds number. One of the aims of the current work is to identify contributions from both dipole and quadrupole sound sources which may exist at high angles of attack in compressible flow. Additionally, the practical challenges for carrying out accurate numerical simulations of stalled flows will be discussed, focussing on an extensive investigation into the effect of aerofoil span on numerical predictions of radiated noise.

Speaker information

Dr Jacob Turner, University of Southampton. Dr. Jacob Turner is currently a postdoctoral researcher in the ISVR at the University of Southampton researching aerodynamic noise from separated flow and aerofoil stall. He received his BEng in Aeronautics and Astronautics in 2013, and his PhD in 2019 in the Aerodynamics and Flight Mechanics group at the University of Southampton. During his PhD his work focused on investigating the noise reduction mechanisms of leading-edge serrations through high fidelity numerical simulations.

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