Basic characteristics of wake turbulence flow field of airfoils with serrated trailing edge and straight trailing edge were comparatively analyzed

and noise of two trailing edge structure was measured through line array method. The results show that the turbulence intensity of wake turbulence flow field and turbulence intensity in three directions of airfoil with serrated trailing edge are significantly reduced compared with airfoil with straight trailing edge. The noise field results show that trailing edge noise has a huge decrease on airfoil with serrated trailing edge

while the leading edge noise is nearly the same. Serrated structure widens the wake region and accelerates the breakdown of large vortex

resulting in additional horseshoe vortex. Turbulence decay rate along the flow direction becomes larger.