3. Research on Highly Skewed Propellers (2nd Report)

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概要

• 論文の詳細を見る

• Model experiments were performed on propeller blade stress and flow on the blade by using three propeller models designed in the 1st report. Results of the experiments showed that in ahead operation, blade stress of the 72° Highly Skewed Propeller (HSP) was about two times that of the Conventional Propeller (CP) and that blade stress of the 72° HSP in crash astern operation was about two times that in ahead operation. These measured blade stresses were compared with those calculated by propeller lifting surface theory and Finite Element Method (FEM), and close agreement was found between them. It was also confirmed from the model test results that in both ahead and astern operations except extremely heavily loaded astern operation, no stall was seen and the potential flow might be taken as a two-dimensional flow in the cicumferential direction on blades of HSP. On the basis of research results of the above and the 1st report on HSP, solid type 46° HSP was designed for a car carrier "Chijin-Maru" of 3,200 carrying capacity. The 46° HSP design procedure is outlined in this paper. Model tests were performed to compare the performance characteristics of the 46° HSP with those of CP. Results of the tests demonstrated that the 46° HSP decreased propeller-induced fluctuating pressure by about 40 percent on the hull surface and decreased sheet cavitation on the blade back without decreasing propeller efficiency. Then, the 46° HSP was applied to the car carrier and full scale measurements were carried out. The car carrier cleared design speed at the official sea trial. Further, results of full scale experiments proved that local vibration on the hull was in low level sufficiently in comparing with the other car carriers and that blade stresses measured in a ahead and crash astern operations were close to the estimated values and no problem was involved on strength of the 46° HSP. Adequately designed HSP can deduce vibratory propeller forces without lowering the other propeller performance characteristics and it should be considered to apply HSP to any ships with vibration problems involved.

• 社団法人日本船舶海洋工学会の論文

著者

• Takahashi Michio

  Nippon Kaiji Kyokai

• BABA Nobuhiro

  Nippon Kaiji Kyokai

• Ito Masamitsu

  Kobe Steel Ltd.

• Soh Tadashi

  Kobe Steel Ltd.

• Fujimoto Toshio

  Kobe Steel Ltd.

• SASAKI Yasuo

  Nippon Kaiji Kyokai

• YAMASAKI Shosaburo

  Kobe Steel Ltd.

• OKU Masamitsu

  Kobe Steel Ltd.

• HAYAMI Nobuhiro

  Kobe Steel Ltd.

• IWAKI Keizo

  Tsuneishi Shipbuilding Co., Ltd.

• Iwaki Keizo

  Tsuneishi Shipbuilding Co. Ltd.

関連論文

• Engineering Method of Sound Power Determination for Marine Engines
• 4. Analysis of Three Dimensional Flow around Marine Propeller by Direct Formulation of Boundary Element Method
• 3. Research on Highly Skewed Propellers (2nd Report)
• 2. Research on Highly Skewed Propellers
• 6. Full-Scale Comparative Experimental Study on Propeller Excited Vibratory Forces and Hull Vibrations Induced by a Highly Skewed Propeller and a Conventional Propeller

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