Effect of trailing edge serration-flow misalignment on airfoil noise emissions

The broadband noise generated by the scattering of turbulent flow at the trailing edge of a NACA 0018 airfoil with trailing edge serrations is investigated, varying both the airfoil angle of attack and serration flap angle. Acoustic emissions from the trailing edge are measured using a microphone array. The noise level is observed to be...

Broadband Trailing-Edge Noise Reduction Using Permeable Metal Foams

Boundary layer characterization and acoustic measurements of flow-aligned trailing edge serrations

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...

APIAN-INF: A Low-Speed Aerodynamic and Aeroacoustic Investigation of Pylon – Pusher Propeller Interaction Effects

An experimental investigation was performed at the Large Low-speed Facility of the German-Dutch wind tunnels (DNW-LLF) to study the pylon interactions associated with pusher propellers. The aerodynamic and aeroacoustic effects of pylon trailing edge blowing and swirl recovery vanes (SRVs) were evaluated. The pylon installation increased the...