Experimental investigation of the influences of porous leading and trailing edge on aerodynamic noise

Woodhead, Philip C., Chong, Tze Pei, Joseph, Phillip, Paruchuri,, Chaitanya, Palleja Cabre, Sergi and Geyer, Thomas F. (2024) Experimental investigation of the influences of porous leading and trailing edge on aerodynamic noise. In 30th AIAA/CEAS Aeroacoustics Conference, 2024. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2024-3339).

Abstract

This paper investigates the effects of either single or multiple rows of pores applying to the leading edge and trailing edge, either respectively or collectively, for the reduction of aerofoil noise. The underlying mechanism is the acoustic interference through the physically displacement of two scattering sources longitudinally to execute acoustic-wave phase-cancellation. The experiment was conducted on a NACA-4505 aerofoil at Reynolds number between 2 × 10^5 to 4 × 10^5 and −6°, 0° and 6° geometrical angles of attack. The present study investigated four cases: (1) baseline, (2) downstream porous leading edge, (3) single and duo-line porous trailing edge, and (4) combination of (2) and (3). The experiments were performed with either tripping the boundary layer, bypass transition by elevated freestream turbulence from coarse grid, or combination of both trip and grid. This paper predominantly shows the noise results, which confirm that acoustic interference can be effectively executed under specific flow conditions for the downstream porous leading edge targeting the leading edge noise, and single and duo-line porous trailing edge targeting the trailing edge noise. Achieving simultaneous reductions in the leading edge and trailing edge noise across a large frequency range has been positively demonstrated in this study.

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Contributors

Author: Sergi Palleja Cabre

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