THE MEAN AND OSCILLATORY FORCES ON A HYDROFOIL WITH COMBINED NATURAL AND FORCED VENTILATION FROM EXPERIMENTS IN REGULAR WAVES

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).

• Corporate Authors:

  David Taylor Naval Ship R&D Center

  Ship Performance Department
  Bethesda, MD  United States  20084
• Authors:
  • Stahl, R
  • Zarnick, E E
• Publication Date: 1975-5

Media Info

• Pagination: 53 p.

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Angle of attack; Cavitation; Depth; Drag; Hydrodynamics; Hydrofoil boats; Stream channels; Test facilities; Test procedures; Ventilation systems; Water waves; Wave motion; Waves
• Uncontrolled Terms: Model tests
• Old TRIS Terms: Hydrofoil craft; Regular waves; Water channels
• Subject Areas: Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00091769
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SPD-626-01 Final Rpt.
• Files: TRIS
• Created Date: Sep 10 1975 12:00AM