INFLUENCE OF EDGE VIBRATIONS ON HYDROFOIL AND PROPELLER TRAILING-EDGENOISE

The influence of vibrations of foils (hydrofoils and propeller blades) on the characteristics of their trailing-edge noise is investigated e xperimentally. It is shown that vibrations have the effect of increasi ng the intensity of flow-induced radiation and introducing peaks in th e spectrum at the natural frequencies of the hydrofoil by regularizing and amplifying the intensity of vortices shed from the trailing edge of the hydrofoil. It is established that the trailing-edge noise of a vibrating hydrofoil and the singing of blade assemblies have the same physical nature.