EXPERIMENTS ON SOUND RADIATION FROM PROPELLER BLADES

This report is in microfiche form. Experiments have been made in water basins on specimens approximating in shape to propeller blades and made from various materials in order to investigate the radiation of cavitation noise. It is concluded that a sharp edge appears to provide negligible hydro-acoustic damping. The effect of constrained layer damping appears to be small. Aluminium as a blade material had some influence on the radiation, while a bubbl screen located close to the source caused a strong reduction of radiated sound power.