Effect of incoming flow turbulence intensity on rod-airfoil aerodynamic interaction noise

The effect of incoming turbulence intensity on the aerodynamic interaction noise of a rod-airfoil configuration is investigated by compressible large eddy simulation and Ffowcs Williams–Hawkings equation. The inlet position of the computational domain is determined by computing the turbulence intensity and mean velocity from the inlet to the rod leading edge. The mean velocity upstream of the airfoil is compared with experimental measurements to determine rod offset. The far-field sound predictions are consistent with the experimental measurements, demonstrating the validity of the computational model and applied methods. An increase in turbulence intensity increases the primary peak frequency of the power spectral density for the far-field sound. Moreover, the amplitude of the primary peak of the far-field acoustic pressure, overall sound pressure level of the far-field sound, stability of the large-scale vortex structures, and energy proportion of the first two proper orthogonal decomposition modes decreases with increasing incoming turbulence intensity.