Abstract
Serrated trailing edge structure based on the principle of bionics of the airfoil was an effective means to reduce the airfoil trailing edge noise, but the physical mechanism of noise reduction is still not fully studied. Characteristics of turbulent wake flow and noise results of airfoils with and without serrated trailing edge would be comparatively analyzed through hot wire anemometer and line array. It can be seen wake flow turbulence and the turbulence intensity in three directions of serrated trailing edge airfoil are significantly reduced compared to baseline airfoil. The sound field showed trailing edge noise had a huge decrease on serrated trailing edge airfoil, the leading edge noise is nearly the same. Serrated trailing edge structure widens the wake region and accelerates the large vortex to breakdown, resulting in additional horseshoe vortex. Turbulence decay rate along the flow direction becomes larger.
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