An Experimental Investigation of Wall-Mounted Finite Airfoil Turbulent Boundary Layer Noise
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Measurements of flow-induced wall-mounted finite airfoil noise have been taken in the Stability Wind Tunnel at Virginia Tech to examine the influence of airfoil three-dimensionality on noise production. The airfoil has an aspect ratio (ratio of airfoil span, L, to chord, C) of \(L/C = 3\) and measurements encompass variations in geometric angle of attack of \(\alpha = 0\) to \(12^\circ \) at a Reynolds number of \(Re_c=1.6 \times 10^6\) (based on chord). The results include far-field acoustic spectra and sound maps taken with a microphone array and reveal contributions of flow at the airfoil tip and wall junction to noise production.