Abstract
This study concerns the mechanisms of the turbulent broadband noise reduction for cascade trailing edge serrations while the inlet velocity changed from 30 m/s to 50 m/s. The turbulence spatio-temporal information are measured with 3D hot-wire. The experiment is carried out in the Northwestern Polytechnical University low speed open jet wind tunnel. It showed the spreading rate of the wake and the decay rate of the wake centerline velocity deficit increased with serrated edge compared to the straight edge, and the three components of velocity changed differently with serrated trailing edge. It is also found that the turbulence peak occurs further from the airfoil surface in the presence of the serrations, and the serrations widened the mix area, which allowed the flow mixed together ahead of the schedule.
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