EFFECT OF A PROTUBERANCE AND ASPECT RATIO ON THE INCEPTION OF VENTILATION ON A SURFACE-PIERCING STRUT IN CAVITATING FLOW

A 2-foot chord, 12 percent thick, symmetric strut was towed vertically in the high-speed basin at Naval Ship Research and Development Center (NAVSHIPRANDCEN). The purpose of the experiment was to extend a study of the effect of aspect ratio on surface piercing strut ventilation characteristics and to determine the effect of a strut surface protuberance on these characteristics. Increasing the aspect ratio increased the susceptibility to ventilation. A protuberance which extended a small distance below the free surface on the low-pressure side reduced side force coefficients and increased susceptibility to ventilation. The effect of the protuberance when positioned just aft of the leading edge was more pronounced than at midchord or further aft. (Author)

• Corporate Authors:

  David Taylor Naval Ship R&D Center

  Ship Performance Department
  Bethesda, MD  United States  20084
• Authors:
  • Rothblum, R S
  • Dailey, N L
  • Pattison, J H
• Publication Date: 1972-6

Media Info

• Pagination: 18 p.

Subject/Index Terms

• TRT Terms: Hydrofoil boats; Hydrofoils; Ventilation systems
• Old TRIS Terms: Cavitating hydrofoils; Hydrofoil craft; Surface piercing hydrofoils; Ventilated hydrofoils
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00147774
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SPD-479-02 Eval Rpt.
• Files: TRIS
• Created Date: Feb 16 1977 12:00AM