Application of a Beamforming Technique to the Measurement of Airfoil Leading Edge Noise
Figure 9
Power spectral density ( 1 /Hz) of the turbulent velocity fluctuations, measured at a nominal flow speed m/s approximately at m, 0.007 m upstream of the leading edge of the non-porous reference airfoil at mid-span (turbulence grids: (blue —) PPS 12/2, (red —) PPS 14/4).
