Boundary layer characterization and acoustic measurements of flow-aligned trailing edge serrations
Carlos Arce León (Aerodynamics and Acoustics Group, TU Delft - Aerodynamics)
Roberto Merino Martinez (TU Delft - Aircraft Noise and Climate Effects)
Daniele Ragni (TU Delft - Wind Energy)
Francesco Avallone (TU Delft - Wind Energy)
Mirjam Snellen (TU Delft - Aircraft Noise and Climate Effects)
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Abstract
Trailing edge serrations designed to reduce airfoil self-noise are retrofitted on a NACA 0018 airfoil. An investigation of the boundary layer flow statistical properties is performed using time-resolved stereoscopic PIV. Three streamwise locations over the edge of the serrations are compared. An analysis of the results indicates that, while there is no upstream effect, the flow experiences significant changes as it convects over the serrations and toward its edges. Among the most important, a reduced shear stress and modifications of the turbulence spectra suggest beneficial changes in the unsteady surface pressure that would result in a reduction of trailing edge noise. Microphone array measurements are additionally performed to confirm that noise reduction is indeed observed by the application of the chosen serration design over the unmodified airfoil.
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