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The present study investigates the aerodynamic noise signature of symmetric airfoils with different thickness. Aerodynamic noise from NACA 0012 and NACA0018 airfoils at different velocities and angles of attack were measured and compared to ascertain the differences in noise characteristics. Experiments were conducted using two airfoils models (NACA 0012 and NACA 0018) with chord 150mm and span 200 mm. Acoustic measurements were carried out in an in-house constructed open jet semi-anechoic chamber having wedge tip-to-tip distance of 2.5 m × 2.5 m × 2.5 m size. Experiments were conducted at different free stream velocities with Reynolds numbers (based on airfoil chord) ranging between 0.5×105 to 5×105. Results show that the far-field noise generated from both airfoils are similar at zero angle of incidence and significantly different at higher angles of attack. Directivity studies are done by measuring the noise at different angles from the upstream of the airfoil to downstream, to characterize the aerodynamic noise. The directivity plot obtained is similar to a convected dipole pattern. The OASPL (Overall Sound Pressure Level) variation of both airfoils at different Reynolds Numbers and angles of attack will be reported in this paper.
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