AN EXPERIMENTAL STUDY OF THE EFFECTS OF WAVES ON THE VENTILATION OF SURFACE-PIERCING STRUTS

An experimental program was conducted to investigate the effects of waves on ventilation inception for two surface-piercing strut models of one-foot chord length. The majority of tests were conducted with a strut model of leading edge radius equal to 1.82 percent of the chord length. Tests were performed in head and following waves and at 8 and 10 degrees yaw. Low ambient pressures were utulized to obtain ventilation inception in the presence of cavitation in the Froude number range 2.5 to 5. Exploratory tests were also conducted with a strut model with a sharp leading edge. The effects on ventilation inception under the various wave conditions were compared on the basis of cavitation number required for ventilation inception. For the blunt-leading-edge strut at a Froude number of 3.2, the cavitation number was increased by a factor of up to two for ventilation in waves. The magnitude of the wave influence decreased as the Froude number was increased until at a Froude number of 5 a factor of up to 1.3 was obtained. For the sharp-leading-edge strut, ventilation inception occurred at greatly increased cavitation numbers of five to ten times those for calm water. (Author)

• Corporate Authors:

  Lockheed Missiles and Space Company Incorporated

  111 Lockheed Way
  Sunnyvale, CA  United States  94088
• Authors:
  • Kramer, R L
• Publication Date: 1970-11

Media Info

• Pagination: 65 p.

Subject/Index Terms

• TRT Terms: Cavitation (Mechanics); Hydrofoils; Ventilation systems; Water waves
• Old TRIS Terms: Surface piercing hydrofoils
• Subject Areas: Design; Hydraulics and Hydrology; Marine Transportation;

Filing Info

• Accession Number: 00016728
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: LMSCED029678 Final Rpt
• Contract Numbers: N00014-70-C-0096
• Files: TRIS
• Created Date: Oct 29 1973 12:00AM