Effects of Boundary-Layer Development on Cavitation Noise and Inception on a Hydrofoil.
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
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Measurements are described of noise from cavitating flow over hydrofoils. The experiments were performed in a variable pressure water tunnel that was acoustically calibrated so that sound power levels could be deduced from the sound measurements. It was partially reverberant in the frequency range of interest. Cavitation was generated on the low-pressure side of a hydrofoil in the presence of a separated laminar boundary layer on the one hand and of a fully turbulent attached boundary layer on the other. The turbulent boundary layer was formed downstream of a trip, which was positioned near the leading edge. High-speed photographs show patterns of cavitation obtained in each case. Cavitation was also generated on the high-pressure side at negative angles of attack. The noise is shown to depend on the type of cavitation produced for each type, dependence on speed and cavitation index has been determined. Author
- Marine Engineering
- Fluid Mechanics