SURVEY OF THERMOCLINES AND DRAG-REDUCTION PROPERTIES OF WATER IN THE MAJOR BASINS AT THE NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER

A systematic survey of temperature variation with depth was conducted in the David W. Taylor Model Basin (TMB) and the Maneuvering and Seakeeping (MASK) facilities at the Naval Ship Research and Development Center. Water samples from the basins were periodically tested for the presence of drag-reducing substances. A significant upper thermocline and an overall temperature gradient were found in the two basins of TMB. A weak, transient gradient was found in the seakeeping basin of MASK. No significant gradient could be found in the rotating-arm basin of MASK. Except for two highly transient occurrences in the drydock area of the rotating arm, none of the samples from the basins exhibited significantly lower drag. A tendency for slightly lower drag, 1 percent or less, was noted in the TMB basins. Precautions that are taken at the Center to prevent buildup of drag-reducing substances in the experimental facilities appear to be highly effective. It is possible that with proper simulation techniques, several interesting stratified-flow phenomena can be studied, using existing facilities.

• Corporate Authors:

  Naval Ship Research and Development Center

  Ship Performance Department
  Bethesda, MD  United States  20034
• Authors:
  • Santelli, N
• Publication Date: 1973-11

Media Info

• Features: Appendices; References;
• Pagination: 22 p.

Subject/Index Terms

• TRT Terms: Drag; Model basins; Temperature measurement
• Old TRIS Terms: Drag reduction
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00054219
• Record Type: Publication
• Source Agency: Naval Ship Research and Development Center
• Report/Paper Numbers: NSRDC #4089
• Contract Numbers: Task SF43421007
• Files: TRIS
• Created Date: May 7 1974 12:00AM