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2003 Fiscal Year Final Research Report Summary

A Study on Improvement of Performance of Ship Propulsion Device Directly Driven by Steam

Research Project

Project/Area Number 13450077
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionKobe University

Principal Investigator

TSUTAHARA Michihisa  Kobe University, Graduate School of Science and Technology, Professor, 自然科学研究科, 教授 (10031139)

Co-Investigator(Kenkyū-buntansha) SAKAMOTO Masahiko  Nara National College of Technology, Associate Professor, 助教授 (00225822)
KATAOKA Takeshi  Kobe University, Graduate School of Science and Technology, Research Associate, 自然科学研究科, 助手 (20273758)
OGAWA Kazuhiko  Kobe University, Department of Engineering, Associate Professor, 工学部, 助教授 (30252802)
Project Period (FY) 2001 – 2003
KeywordsShin propulsion device / Flow inside nozzle / Unsteady flow / Air-water two-phase flow / Flow visualization
Research Abstract

By visualizing the flow inside the nozzle by high-speed video camera, it is shown that the flow is not a mixed flow of air and water but a flow in which the air and the water are separated and waves with large amplitude appear on the interface. These waves close the air flow and the pressure rises and the pressure accelerate the water, towards downstream. It is also shown that the mechanism in accelerating the water is not mixing but the volume of water accelerated by air pressure without mixing. So the loss is smaller than the mixing mechanism. The case of intermittent emission, the thrust itself does not increase, but the propulsive efficiency considering the emission duration, the operation of intermittent emission is better.
The numerical simulation by the finite difference lattice Boltzmann model for two fluids gives good results. On the interface between the two fluids, large-amplitude waves appear. But in this model the densities of the two fluids are the same, then we tried to improved the two-fluid model. The density difference corresponds to the acceleration difference, so by modifying the acceleration the density difference can be simulated. For single-phase flows, this technique is shown to be successful. A new model with choosing specific heats for multi-atomic gas is also introduced.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] M.Tsutahara, K.Ogawa, M.Sakamoto: "Study of Ship Propulsion Equipment Directly Driven by Steam"Proceedings of second international workshop on ship hydrodynamics. September. 94-101 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tsutahara, K.Ogawa, M.Sakamoto, 他3名: "Simulation of flows in a semi-open-type nozzle for ship's propulsion equipment by the finite difference lattice Boltzmann method"Proceedings of third international workshop on ship hydrodynamics. September. 67-72 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tsutahara, K.Ogawa, M.Sakamoto, T.Matsui: "Nozzle flow of a ship propulsion equipment driven by high-pressure gas"Proceedings of FEDSM'03,4TH ASME_JSMEJOINT FLUIDS ENGINEERING CONFERENCE. (CD-ROM)F-311TOC. FEDSM2003-45092 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kataoka, M.Tsutahara: "Lattice Boltzmann model for the compressible Navier-Stokes equations with flexible specific-feat ratio"Physical Review E. Vol.69. 035701(R) (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Michihisa Tsutahara, Kazuhiko Ogawa, Masahiko Sakamoto: "Study of Ship Propulsion Equipment Directly Driven by Steam"Proceedings of Second International Workshop on Ship Hydrodynamics. 94-101 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Michihisa Tsutahara, Kazuhiko Ogawa, Masahiko Sakamoto, Takahiro Matsui, Shinsuke Tajiri, Masakazu Tajima: "Simulation of flows in a semi-open-type nozzle for ship s propulsion equipment by the finite difference lattice Boltzmann method"Proceedings of Third International Workshop on Ship Hydrodynamics. 67-72 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Michihisa Tsutahara, Kazuhiko Ogawa, Masahiko Sakamoto, Takahiro Matsui: "Nozzle Flow of a Ship Propulsion Equipment Driven by High-Pressure Gas"Proceedings of FEDSM 03, 4^<th> ASME-JSME Joint Fluids Engineering Conference, Hawai, USA. F-311 TOC.(CD-ROM). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeshi Kataoka, Michihisa Tsutahara: "Lattice Boltzmann model for the compressible Navier-Stokes equations with flexible specific-heat ratio"Physical Review E. Vol.69. 035701(R) (2004)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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