Aerodynamic Noise Reduction Using Active Flow Control Techniques

Experimental studies using active flow control techniques for trailing edge noise reduction have been carried out. The experiments were performed for a flat plate test rig, equipped with different types of active flow control devices, namely steady boundary layer suction, steady blowing and unsteady blowing using sweeping jet actuators. The results of the boundary layer surface pressure energy spectra show that the proposed active flow control methods can offer significant reduction in the trailing edge noise, particularly at low frequencies, where passive noise control techniques, such as serrations, are not particularly effective. Further experiments are planned to study the aerodynamic benefits of the proposed methods and also their effects on flow mixing and lateral coherence of the turbulent structures within the boundary layer and wake