EXPERIENCE AFTER ONE YEAR OF TESTS IN THE NSMB DEPRESSURISED TOWING TANK

With the rapid increase in size and speed of modern ships the propeller loading has increased considerably, making the problems of cavitation erosion and vibrations more severe. At the same time it is impossible to neglect the interaction between hull, rudder and propeller. Describes procedures at the NSMB Depressurised Towing Tank built to test the propeller in cavitating condition behind the ship model. This can be done by lowering the pressure above the water surface, with a minimum pressure of 400 kb/sq m, leading to a maximum scale ratio of about 34. To be able to test large ships, the model size has to be up to 12 meters, which is the standard model length in the Depressurised Towing Tank (Vacutank). This model size involves large tank dimensions, which are 240 x 18 x 8 meters. The basin is covered with an airtight concrete shell. The carriage is an H- form tube construction, in which atmospheric conditions can be maintained.

  • Supplemental Notes:
    • Symposium on High Powered Propulsion of Large Ships, Part 1, December 10-13, 1974, Wageningen, Netherlands. Entire proceedings-2 volumes, 26 papers-available for $21.00.
  • Corporate Authors:

    Netherlands Ship Model Basin

    Haagsteed 2, P.O. Box 28
    Wageningen,   Netherlands 
  • Authors:
    • Van Den Berg, W
    • Kupier, G
  • Publication Date: 1974-12

Media Info

  • Features: References;
  • Pagination: 28 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00128927
  • Record Type: Publication
  • Source Agency: Netherlands Ship Model Basin
  • Report/Paper Numbers: No. 490
  • Files: TRIS
  • Created Date: Feb 4 1976 12:00AM