A STUDY OF THE SCALE EFFECT ON WAKE, PROPELLER CAVITATION, AND VIBRATORY PRESSURE AT HULL OF TWO TANKER MODELS

The scale effect of mean wake and wake distribution has an important influence upon the predictions of shaft horsepower, cavitation extension, cavitation erosion, and propeller-induced vibratory pressure at hull made from model tests in towing tanks and cavitation tunnels. To clarify some of these problems a scale effect study has been carried out in the large cavitation tunnel at the Swedish State Shipbuilding Experimental Tank (SSPA). Different effective Reynolds numbers were obtained primarily by varying the water speed, but also the influence of shortening the models by taking away the parallel middlebody was studied. Results of measurements of velocity and static pressure both in the propeller plane and ahead of the propeller, static pressure along the stern, and pressure fluctuations at the hull above the propeller are given in the paper together with the results of observations of the flow along the stern and propeller cavitation. A prediction method for the full-scale wake pattern is also presented.

• Supplemental Notes:
  • Presented at the SNAME Annual Meeting, New York, N.Y., Nov. 16-16, 1974.
• Corporate Authors:

  Society of Naval Architects and Marine Engineers

  601 Pavonia Avenue
  Jersey City, NJ  United States  07306-2907
• Authors:
  • Dyne, G
• Publication Date: 1974-11

Media Info

• Features: References;
• Pagination: 19 p.

Subject/Index Terms

• TRT Terms: Cavitation (Mechanics); Cavitation erosion; Fluid resistance; Hulls; Propellers; Reynolds number; Thrust
• Uncontrolled Terms: Hull resistance; Scale effect
• Old TRIS Terms: Model testing; Thrust deduction
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00071643
• Record Type: Publication
• Source Agency: Society of Naval Architects and Marine Engineers
• Report/Paper Numbers: No. 3
• Files: TRIS
• Created Date: Nov 12 1974 12:00AM