PBCF (Propeller Boss Cap Fins) の研究開発 : プロペラボス後部流れの改善

書誌事項

タイトル別名
  • A Research and Development of PBCF (Propeller Boss Cap Fins)
  • PBCF (Propeller Boss Cap Fins) の研究開発
  • PBCF Propeller Boss Cap Fins ノ ケンキュウ カイ
  • Improvement of Flow from Propeller Boss
  • プロペラボス後部流れの改善

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抄録

It is well known that a screw propeller generates free vortexes called tip vortexes and a hub vortex in its slipstream. In this paper, PBCF (Propeller Boss Cap Fins) which diffuses and weakens a hub vortex by changing the flow near by propeller boss cap is proposed in order to enhance the efficiency of ship's screw propeller.<BR>The research and development of PBCF was carried out through Flow Visualization, Propeller Open Test, Self Propulsion Test and On Ship Test to make the PBCF practical.<BR>As the result of various experiments, gains of 3 to 7% in propeller efficiency, gains of approx. 2% in self-propulsion efficiency of 7 m Model ship and gains of approx. 4% in terms of power output on 44, 979 Gross Tonnage PCC “Mercury Ace” were obtained. These data lead us to believe that PBCF can be excellent energy-saving device with its simple structure.

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