Aerofoil noise reduction by active or passive flow control – opportunities and challenges Seminar

Aerodynamic noise radiated from industrial fan blades has been receiving much attention from the civil aircraft, wind turbine, turbomachinary, automobiles and home appliances industries. In many cases, the aeroacoustic behaviour of an aerofoil depends on the boundary layer development over its lifting surfaces, and/or the development of wake downstream. The application of active or passive flow control technique to alter these hydrodynamic features, and to achieve aerofoil noise reduction, has already been demonstrated by many. However, and perhaps ironically, the application of some of these flow control techniques can actually result in a poorer aerodynamic performance. This seminar will discuss some of the active and passive flow control techniques for the reduction of aerofoil noise, and their challenges and further opportunities.