The possibility of trailing edge noise reduction using active flow control is addressed in this paper. The boundary layer is altered with the help of flow injection and suction on a long flat plate upstream of a sharp trailing edge. To study the effects of active flow control on the trailing edge noise generation mechanisms, simultaneous measurements have been taken for the streamwise velocity component using hot-wire anemometry and surface pressure fluctuations with flush mounted microphones. It has been shown that the proposed flow injection and suction methods are capable of reducing the noise over a wide range of frequencies. It has also been revealed that the blowing is effective in shifting the energy containing turbulent structures farther away from the wall, resulting in a significant reduction of measured surface pressure spectra. The boundary layer suction control method was shown to be effective in the reduction of pressure fluctuations in the mid frequency regions, which quickly moves to the lower frequencies at further downstream locations. It has also been observed that the blowing can lead to a significant reduction of trailing edge noise when located close to the trailing edge, and the favourable effects of the flow suction case can be exploited by placing the trailing edge farther from the flow control section.
|Name||Proceedings of the International Congress on Sound and Vibration|
|Publisher||International Institute of Acoustics and Vibration|