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Development of prediction method for two-phase flow under ship bottom considering hydrodynamic characteristics on shell surface

Research Project

Project/Area Number 20H02365
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionTokyo University of Marine Science and Technology

Principal Investigator

Hazuku Tatsuya  東京海洋大学, 学術研究院, 教授 (60334554)

Co-Investigator(Kenkyū-buntansha) 井原 智則  東京海洋大学, 学術研究院, 助教 (70767350)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2021: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2020: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Keywords空気潤滑法 / 気液二相流 / 抵抗低減 / 船舶工学 / 外部流れ
Outline of Research at the Start

船底への空気供給による船舶推進抵抗低減技術(空気潤滑法)において、船底外板表面の粗さや濡れ性は、形成する気液二相流の流動特性と摩擦抵抗特性の制御因子となる。この様な固体壁表面の流体力学的諸特性が大きく変化する船底外板近傍の二相流動構造を高精度に予測できる手法は現在無い。この課題の解決に向けて、本研究では、船底の二相流動構造と摩擦特性に及ぼす固体壁表面の諸特性(粗さ、濡れ性)の影響を適切に再現できる新しい二相流解析手法の構築を目的とし、(1)固体壁表面特性と二相流動構造の流体力学的相関の解明、(2)固体壁表面特性と二相流動構造の流体力学的相関を考慮に入れた新しい二相流構成式の開発を行う。

Outline of Final Research Achievements

From the viewpoint of advancing the air-lubrication method, a technique for reducing ship drag by supplying air to the ship's bottom, the final target of this study was to develop a two-phase flow analysis method that can reproduce the effects of wall surface characteristics on the two-phase flow structure and wall friction characteristics beneath a ship's bottom. Two-phase flow experiments with varying wall surface roughness were conducted using an apparatus that simulates two-phase flow beneath a ship's bottom. An experimental database on velocity distribution in the boundary layer, local two-phase flow structures, and frictional resistance before and after bubble supply was newly constructed. Based on the obtained database, the impact factors, including gas-liquid flow rate and channel wall roughness, were evaluated on the two-phase flow structure and constitutive equations regarding the two-phase flow structure and frictional resistance.

Academic Significance and Societal Importance of the Research Achievements

固体壁面特性と気液二相流の流動構造及び摩擦抵抗の流体力学的相関に着目した研究は、国内外において類例がほとんどなく、その実験的、解析的研究を実施した本研究は、現状に鑑みて学術的意義が大きい。本研究により、特に二相流動構造と摩擦抵抗に及ぼす流路壁面粗さの影響に関する新たな知見が得られ、さらに船底下の二相流動構造と摩擦抵抗特性に関する二相流構成式が新たに開発された。これらの成果は、船底下に形成する二相流の解析技術を進展させるものであり、今後のさらなる研究の推進によって、空気潤滑法による船体抵抗低減技術の高度化が期待できる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (7 results)

All 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (2 results)

  • [Int'l Joint Research] City University of Hong Kong(中国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] City University of Hong Kong(中国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] 水平壁面下の二相流動構造と摩擦抵抗低減2022

    • Author(s)
      波津久達也,井原智則
    • Journal Title

      日本混相流学会混相流シンポジウム2022講演論文集

      Volume: -

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Reduction of skin friction and two-phase flow structure beneath wall in horizontal rectangular channel2022

    • Author(s)
      Hazuku Tatsuya, Ihara Tomonori, Hibiki Takashi
    • Journal Title

      Ocean Engineering

      Volume: 248 Pages: 110846-110846

    • DOI

      10.1016/j.oceaneng.2022.110846

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 超音波による水平矩形流路内気泡流の液相速度場計測2021

    • Author(s)
      井原智則, 波津久達也
    • Journal Title

      日本混相流学会混相流シンポジウム2021講演論文集

      Volume: -

    • Related Report
      2021 Annual Research Report
  • [Presentation] 水平壁面下の二相流動構造と摩擦抵抗低減2022

    • Author(s)
      波津久達也,井原智則
    • Organizer
      混相流シンポジウム2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] 超音波による水平矩形流路内気泡流の液相速度場計測2021

    • Author(s)
      井原智則,波津久達也
    • Organizer
      混相流シンポジウム2021
    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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