EXPERIMENTAL AND THEORETICAL ANALYSIS OF PROPELLER SHAFT FORCES OF CONTRA-ROTATING PROPELLERS AND CORRELATION WITH FULL SCALE DATA

To meet with the recent demands for energy saving, a contra- rotating propeller (CRP) system has been developed and applied to a very large crude carrier. One of the most important problems that stand in the way of practical application of CRP to large ships would be to develop a reliable bearing and sealing system for contra- rotating shafts. Precise estimation of propeller shaft forces acting on the CRP is indispensable to design the bearing system. In this paper, measurements and theoretical calculations of unsteady propeller shaft forces of a CRP operating behind a ship in both model and full scales are described. Measurements of unsteady propeller shaft forces during straight run and turning manoeuvres were conducted in a seakeeping tank. Unsteady propeller shaft forces were calculated by a lifting surface theory based on the Quasi-Continuous Method, using the measured wake distribution and compared with the results of the model test. It was found that the calculated propeller shaft forces were in good agreement with the model experiments. Measurements of propeller shaft forces of the CRP were also conducted in full scale. Propeller shaft forces of the CRP in full scale coincided well with those predicted from the model experiments, not only in straight run but also in turning condition.

  • Supplemental Notes:
    • Propellers/Shafting '94 Symposium; 20-21 Sept 1994; Virginia Beach, VA, USA. Sponsored and Publ by SNAME, USA. Pprs. Ppr no 23 [17 p, 22 ref, 1 tab, 26 fig]
  • Authors:
    • Hoshino, T
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717713
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM