Abstract

This presentation covers some previously unreported observations in aerofoil turbulence interaction noise experimentation, which aid the development of noise reduction strategies. Through detailed velocity, unsteady surface pressure and far-field noise measurements, the noise generation can be traced from the turbulent inflow to the far-field noise. Further understanding has been gained from studying flows of varying turbulence intensity and length scale, resulting in the identification of the physical changes that affect the far-field noise. The implementation of a porous structure with a set volume in the leading edge region of the aerofoil is understood to reduce the far-field noise. Optimisation of the porous structure for noise reduction is a more difficult task due to the number of control parameters. However, experimental observations contribute to the understanding of porous structures for the reduction of turbulence interaction noise.