This paper presents a comprehensive experimental study on the application of trailing-edge serrations as a passive control method for reducing the unsteady aerodynamics loading and noise on airfoils in tandem configurations. The purpose of this study is to investigate the effectiveness of serrated trailing-edge on cambered NACA 65-710 airfoil to control and reduce the turbulent flow within the gap area between the two airfoils. The wake flow characteristics for an isolated cambered NACA 65-710 airfoil with and without the trailing-edge serration treatment have been carried out using two-dimensional Particle Image Velocimetry (PIV) method. The acoustic signature of the tandem airfoil is also presented for the near- and far-field noise measurements. Flow experiments were performed using sawtooth serration with different wavelength, for several tandem airfoil configurations (different airfoil gap distances). The results show that the use of serrations can generally lead to a significant reduction in the turbulent kinetic energy within the gap region, due to the interaction between the flows issued from the tip and root of the serration. The near- and far-field noise results have shown that a significant noise reduction can be achieved, especially with a sharp sawtooth serration.
