A PRESWHIRL STATOR-PROPELLER SYSTEM AS A RELIABLE ENERGY-SAVING DEVICE

Procedures for the design, analysis and model tests of a preshwirl stator-propeller system for a 300,000 dwt VLCC are described. The preshwirl stator-propeller system, which recovers the propeller slipstream rotational energy is selected as the most reliable energy saving device due to its simple shafting system. The calculated rotational velocity components in the slipstream of the stator-propeller system are in fair agreement with the measured velocity components by a laser-doppler velocimetry. Five stators were designed and tested using the existing propeller in order to verify the effectiveness of the stator-propeller system. Open-water tests varying the pitch angles were conducted in a cavitation tunnel and a towing tank. Resistance and self-propulsion tests were conducted in the towing tank to verify the effectiveness of the stator- propeller system. Two prediction methods of powering performance based on the hull-stator-propeller interaction are proposed and described to estimate the powering performance of a full scale ship. Open-water test results showed 4~6% increase in propulsion efficiency of the stator-propeller systems compared to that of the single propeller. Maximum 6.5% decrease in delivered power at the design speed (15.5 knots) would be achieved with the designed stator-propeller system.

  • Supplemental Notes:
    • Propellers/Shafting '94 Symposium; 20-21 Sept 1994; Virginia Beach, VA, USA. Sponsored and Publ by SNAME, USA. Pprs. Ppr no 9 [16 p, 14 ref, 8 tab, 32 fig]
  • Authors:
    • K-S
    • Kim, Moon Jeong
    • M-C
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717701
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM