The Mean and Oscillatory Forces on a Hydrofoil with Combined Natural and Forced Ventilation from Experiments in Regular Waves
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT
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An experimental investigation was made to determine the mean and oscillatory lift and drag forces on a hydrofoil with combined natural and forced ventilation in regular waves. Natural ventilation was provided by the addition of wedges to the after end of the foil strut. Forced ventilation was provided by blowing air through slots in the upper surface of the foil. The experiments were conducted with the foil operating in regular waves of several different lengths at various speeds and foil depths. Results are presented showing the variation of the mean and oscillatory components of cavitation number based on cavity pressure, lift coefficient and drag coefficient with ventilation index a measurement of the air flow rate.
- Marine Engineering
- Fluid Mechanics