Directivity control of sound generated from flow past NACA0012 airfoil

What is it about?

This article discusses an active control method i.e. periodic suction -blowing excitation to control the directivity of the tonal noise generated due to fluid flow over a NACA0012 airfoil. The application of excitation induce monopole sound and a drag dipole sound. These new sound sources superimpose with vortex-shedding induce dipole sound source to create bias in the sound directivity. By varying the parameters of the excitation, sound waves can be propagate in the specified direction.

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Why is it important?

Controlling aeroacoustic noise from airfoils has become a critical area of research due to the rapid growth in the use of drones and UAVs in recent years. This study examines the mechanism of sound generation from a NACA0012 airfoil and evaluates a control method with the potential to direct the propagation of sound waves from the airfoil effectively.