The effect of anisotropy and walls on leading-edge noise

Abstract: Leading edge has been extensively studied numerically, analytically, and experimentally assuming the incoming turbulence is isotropic. This talk will detail analytical and numerical work investigating the effect of anisotropy on leading-edge noise. This is a relevant problem for ultra high bypass turbofan engines where anisotropic turbulence can be found in the wakes between the fan and OGVs due to the relatively short nacelle. It is also relevant for open rotors and unducted fans where the rotors interact with boundary layers on the aircraft fuselage, which contain anisotropic turbulence.
The fuselage also introduces another effect for these applications, viz. the effect of walls on leading edge noise. For open-rotors and unducted fans, the effect of the wall on the leading-edge noise also needs to be considered. Anisotropic turbulence presents a significant redistribution of the energy in the turbulence spectra in comparison with an isotropic baseline even for values representative of the anisotropy in the fan wakes from aero-engines, which affects the resulting noise spectra.

Bio: David Angland is director of the Airbus Noise Technology Centre at the University of Southampton. This centre was established in 2008 as a result of the long-standing collaboration between Airbus and the University of Southampton on a range of noise research and development projects. His research interests lie in high-lift device noise, bluff body noise, active flow control, phased microphone array technology, leading edge noise, turbomachinery noise and plasma actuators. He has been PI on grants from industry, TSB, ATI, and the European Union.