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Measurement and Analysis of Surface Force and Cavitation of Actual Ship Equipped with CPP

Research Project

Project/Area Number 02650315
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionKobe University of Mercantile Marine

Principal Investigator

NISHIKAWA Eiichi  Department of Propulsion Systems Engineering, Dr. Eng., Professor, 商船学部・機関システム工学講座, 教授 (90029124)

Co-Investigator(Kenkyū-buntansha) UCHIDA Makoto  Department of Propulsion Systems Engineering, Assistant, 商船学部・機関システム工学講座, 助手 (90176694)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsMarine propeller / Surface force / Cavitation / Pressure fluctuation / Controllable pitch Propeller / Actual ship data / 船用プロペラ
Research Abstract

Measurements and Analysis were carried out regarding pressure fluctuation on hull surface just above a propeller and propeller cavitation phenomena by the use of a actual ship "Fukae-marul", which is a training ship of Kobe University of Mercantile Marine, and has the displacement 762tonnes, the length between perpendiculars 45m, and a 4-bladed skewed and controllable pitch propeller with diameter 2.1m.
1 A stroboscope synchronized with propeller revolution and a video camera were mounted on the outside hull near propeller. Experimental voyages were carried out in nighttime and in clear water area of the Kii Channel, and succeeded in recording cavitation phenomena.
2 The data of pressure fluctuation were also successfully obtained at various conditions of propeller revolution and blade angle. There have been reported so far a very little data regarding actual ship equipped with a CPP. The data obtained here, therefore, can be considered to be-very valuable.
3 Pressure fluctuation is great … More ly influenced by cavitation in both of amplitude and frequency. As for frequency, main component is equal to blade frequency when cavitation does not occur, while the 2nd and 3rd modes of blade frequncy become dominant components as cavitation occurs and glows.
4 Because of being two variables of revolution and blade angle, the influence of CPPship on cavitation characteristics is not so simple as that of FPP-ship. The analysis could have found that blade attack angle could be a possible variable to be able to unify the influences of both variables mentioned above.
5 There have been so far several methods which estimate the propeller surface force taking into consideration of cavitation effects. Three of them examined about their validities. It was revealed that these conventional methods are valid, though ia a limited extent, for FPP-ship. For CPP and/or skewed propeller, however, all of them are not valid.
It would be a future task to develop new estimation method being adaptable not only for FPP but also for CPP and skewed propeller. Less

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 西川 栄一,内田 誠他: "可変ピッチプロペラ装備船のサ-フェ-スフォ-スの測定" 関西造船協会誌. No.212. 81-88 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 西川 栄一,内田 誠他: "可変ピッチプロペラ装備船のサ-フェ-スフォ-スー実測値と簡易推定値との比較ー" 関西造船協会誌. No.217. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] E., Nishikawa, M., Uchida, et al: "Surface Force Measurements of Actual Ship with Controllable Pitch Propeller" J. Kansai Soc. Naval Architects. NO. 212. 81-88 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] E., Nishikawa, M., Uchida, et al: "Surface Force of Actual Ship with Controllable Pitch propeller, -- Comparison with simplified estimation and measurement --" J. Kansai Soc. Naval Architects. NO. 217. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 西川 栄一,内田 誠,藤岡 哲哉: "可変ピッチプロペラ装備船のサ-フェ-スフォ-スー実測値と簡易推定値との比較ー" 平成3年度秋季造船三学会連合大会 論文前刷(関西造船協会関係). 21-24 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 西川 栄一,内田 誠,藤岡 哲哉: "可変ピッチプロペラ装備船のサ-フェ-スフォ-スー実測値と簡易推定値との比較ー" 関西造船協会誌. 217号. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 西川 栄一,内田 誠,他3人: "可変ピッチプロペラ装備船のサ-フェ-スフォ-スの測定" 関西造船協会誌. 212号. 81-88 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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