Conference_programme: 2.1 - Aeroacoustics
Lecture: Three-dimensional effects in the reduction of turbulence-impingement noise of aerofoils by wavy leading edges
Author(s): Bampanis Georgios, Roger Michel
Summary:
The present work is aimed at investigating experimentally the three-dimensional features of the noise radiated by turbulence impinging on the leading edge of a rectangular aerofoil and its reduction by means of an appropriate wavy design of the leading edge. Turbulence-impingement noise is involved in many engineering applications including aircraft propulsion, air conditioning and ventilation systems, and so on. The wavy leading edge is already recognized as an effective aerofoil noise reduction mean but its effectiveness off the mid-span plane has not been addressed yet in spite of its interest for rotating-blade technologies. A dedicated setup is considered in the present work. The aerofoil is held in grid-generated turbulence at the nozzle of an open-jet wind tunnel, between very narrow end-plates, so that the microphone can be placed off the mid-span plane without suffering from masking by the plates. Experiments are performed with baseline (straight) and wavy leading edges. The effect of radiation angle is discussed and the limitation of far-field measurements is assessed by discussing additional source-localisation results.
Corresponding author
Name: Mr Georgios Bampanis
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: France
