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2004 Fiscal Year Final Research Report Summary

Study on the Removal of the Harmful Drag by Controlling the Interference of Boundary-Layer Flows

Research Project

Project/Area Number 14550139
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionMiyakonojo National College of Technology

Principal Investigator

WATANABE Hideo  Miyakonojo National College of Technology, Department of Mechanical Engineering, Professor (10006190)

Co-Investigator(Kenkyū-buntansha) KOHAMA Yasuaki  Tohoku University, Institute of Fluid Science, Professor (60006202)
KIKUCHI Satoshi  Tohoku University, Institute of Fluid Science, Research Associate, 流体科学研究所, 助手 (40312665)
TAKAHASHI Yuji  Miyakonojo National College of Technology, Department of Mechanical Engineering, Research Associate, 機械工学科, 助手 (70280500)
Project Period (FY) 2002 – 2004
KeywordsBoundary Layer / Interacting Flow / Lift and Drag / Aerotrain / Axial-Flow Fan / Fillet / Grand Effect / Circular Cylinder
Research Abstract

1.Aerotrain is a new type vehicle under development by us, which applies a wing-in-ground effect. It has vertical side wings at the tips of main wings arranged in tandem to regulate automatically its lateral position in a guide way by the wing-in-ground effect between the side wing and the side wall. We performed a series of experiments to improve the performance of Aerotrain by controlling side-wing/wing interaction. Attaching a fillet in the sharp corner of the side-wing/wing combination model, we could considerably improve the aerodynamic characteristics of the model, that is, the drag of the model was decreased and the lift was increased remarkably. As for the lift, the effect of the fillet could be evaluated by separating it from the ground effect.
2.Using a double chamber type small wind tunnel, we conducted an experiment with a small axial-flow fan to improve its performance. When installing a bell mouse on the suction side of the fan, the condition of the inlet flow was improved and the efficiency of the fen rose substantially. But, guide vanes which were installed in the exit of the impeller improved the performance too much.
3.Fluid-force characteristics of a circular cylinder (a main cylinder) affected by a smaller one (a subcylinder) in close proximity to it were studied experimentally. The relative position of both cylinder changed pressure distribution on the main cylinder and its drag coefficient remarkably. Especially, the effect was very large when the subcylinder was put near the front of the main cylinder. Sometimes, large lift force was produced by the interaction with two cylinders. These mechanisms were made clear by visualizing the flow around two cylinders with a smoke-wire method.

  • Research Products

    (12 results)

All 2005 2004 2003 2002

All Journal Article (12 results)

  • [Journal Article] 円柱に働く流体力に及ぼす近接物体の影響2005

    • Author(s)
      前田望, 渡部英夫
    • Journal Title

      第10回高専シンポジウム講演要旨集

      Pages: 152

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Fluid-Force Characteristics of a Circular Cylinder Affected by a Smaller One in Close Proximity to It2005

    • Author(s)
      N.Maeda, H.Watanabe
    • Journal Title

      Proceedings of 10^<th> KOSEN Symposium in Tsuruoka, (in Japanese)

      Pages: 152

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] エアロトレインの翼干渉制御による空力性能向上2004

    • Author(s)
      尹 童熙, 渡部英夫, 小濱泰昭, 菊地 聡
    • Journal Title

      日本機械学会論文集 B編 70・694

      Pages: 1433-1440

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Improvement of the Aerotrain Aerodynamic Performance by Controlling Wing Interactions2004

    • Author(s)
      D.Yoon, H.Watanabe, Y.Kohama, S.Kikuchi
    • Journal Title

      Trans.Jpn.Soc.Mech.Eng.(in Japanese) 70-694

      Pages: 1433-1440

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 風洞縮流胴内壁上に存在するゲルトラ渦に関する研究2003

    • Author(s)
      長濱 聡, 菊地 聡, 小濱泰昭
    • Journal Title

      日本機械学会論文集 B編 69・680

      Pages: 794-800

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] エアロトレインの性能向上を目的としたサイド翼/主翼干渉の制御2003

    • Author(s)
      渡部英夫, 太田福雄, 菊地 聡, 小濱泰昭
    • Journal Title

      日本機械学会論文集 B編 69・686

      Pages: 2230-2236

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Zero Emission High Speed Transport System "Aero-Train"2003

    • Author(s)
      Yasuaki P.Kohama
    • Journal Title

      2003 Italy-Japan Symposium in Miyazaki on Development of New Energy and New Technology for the Protection of nantural Environments and Sources,Oct.16-19,Miyazaki,Japan

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Wing-wing Flow Interaction of the Aero-Train,2003

    • Author(s)
      Dong-hee Yoon, Yasuaki Kohama, Takuma Kato
    • Journal Title

      The 2003 Division of Fluid Dynamics Annual Meeting,Nov.23-25,2003,New Jersey,USA.

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Improvement in Performance of Aerotrain by Controlling Side-Wing/Wing Interaction2003

    • Author(s)
      H.Watanabe, F.Ohta, S.Kikuchi, Y.Kohama
    • Journal Title

      Trans.Jpn.Soc.Mech.Eng.(in Japanese) 69-686

      Pages: 2230-2236

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Zero Emission High Speed Transport System "Aero-Train"2003

    • Author(s)
      Y.P.Kohama
    • Journal Title

      2003 Italy-Japan Symposium in Miyazaki on Development of New Energy and New Technology for the Protection of Natural Environments and Sources, Oct.16-19,Miyazaki, Japan

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Wing-wing Flow Interaction of the Aero-Train2003

    • Author(s)
      D.Yoon, Y.Kohama, T.Kato
    • Journal Title

      The 2003 Division of Fluid Dynamics Annual Meeting, Nov.23-25,2003,New Jersey, USA

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Gortler Vortex System on a Wind-Tunnel Contraction Nozzle Wall2002

    • Author(s)
      S.Nagahama, S.Kikuchi, Y.Kohama
    • Journal Title

      Trans.Jpn.Soc.Mech.Eng.(in Japanese) 69-680

      Pages: 794-800

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

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Published: 2007-12-13  

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