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A Turbulent Flow Control in a Curved Pipe due to Swirling Flows

Research Project

Project/Area Number 10650190
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionOkayama University of science

Principal Investigator

TAKAMI Toshihiro  Faculty of Engineering, Professor, 工学部, 教授 (40144886)

Co-Investigator(Kenkyū-buntansha) ANAKI Keisuke  Faculty of Engineering, Lecturer, 工学部, 講師 (90299181)
MARUYAMA Yuichi  Faculty of Engineering, Assistant Professor, 工学部, 助教授 (20229628)
YANASE Shinichiro  Okayama University, Engineering, Professor, 工学部, 教授 (20135958)
Project Period (FY) 1998 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsTurbulent Flow / Pipe Flow / Secondary Flow / Swirling Flow / Curredn Pipe / Drug Reduction / 低抗減少 / 制御
Research Abstract

A control of turbulent flow through a curved pipe is experimentally investigated using swirling flows. (1) In 1998, in case of weaker swirls injected, a flow friction coefficient of the turbulent curved pipe was found to reduce compared with that of the non-swirling case. (2) In 1999, in a such case of drag reduction, detailed measurements of the velocity distribution revealed that an interesting swingback phenomenon of flow patterns appeared in the vortical flow structure of the developing curved pipe flow. (3) In 2000, in order to understand relations between the flow friction and the flow pattern in the turbulent curved pipe flow, direct measurement methods of the wall shear stress were studied using both a wall film sensor (WFS) and a micro flow sensor (MFS). (4) In 2001, in a strong swirling flow through the curved pipe, developing flow patterns were measured to study relations between flow frictions, swirl intensities and the vortex-core orbit.
The above-mentioned result during 4 years is summarized as follows. The vortex pair of the secondary flow is induced in the turbulent curved pipe flow due to the centrifugal force, to increase the flow friction. When the weak swirling flow/swith the vortex intensity of secondary flow is injected into the curved pipe, the drag reduction occurs according to the decrease of the wall shear stress which is caused by the primary flow unified by the swingback phenomenon in the developing curved pipe flow. On the other hand, when the strong swirling flow is injected, the drag promotion is observed because the primary flow remains to shift inwards and the swirling vortex is not so declined. These phenomenological results indicate that the control of the curved pipe flow using swirling flows is applicable.

Report

(5 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] 高見, 丸山, 荒木, 平賀: "曲がり管内の旋回乱流に関する研究"日本機械学会熊本講演論文集. 0181-2. 163-164 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 桑木, 高見, 丸山: "三次元数値シミュレーションによる熱膜せん断応力センサ周りの流れと熱伝導解析"日本機械学会熱工学講演論文集. 01-9. 377-378 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 高見, 桑木, 平賀: "曲がり管内旋回乱流の減衰"日本機械学会中国四国支部総会講演論文集. 025-1. 237-238 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Takami, Maruyama, Araki and Hiraga: "A Study on Turbulent Swirling Flows in a Curred Pipe(Japanese)"Proc. JSME Kuwamoto Conf.. 018-2. 163-164 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kuwagi, Takami and Maruyama: "3D Numerical Simulation of Flow and Heat Conduction around a Hot-Film Shear Stress Sensor(Japanese)"Proc. JSME Thermal Engineeering Conf.. 01-9. 377-378 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Takami, Kuwagi and Hiraga: "Decline of Turbulent Swirling Flows in a Curver pipe(Japanese)"Proc. JSME Chugoku-Shikoku Conf.. 025-1. 237-238 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 高見, 丸山, 荒木, 平賀: "曲がり管内の旋回乱流に関する研究"日本機械学会熊本地方講演論文集. 018-2. 163-164 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 桑木, 高見, 丸山: "三次元数値シミュレーションによる熱膜せん断応力センサ周りの流れと熱伝導解析"日本機械学会熱工学講演論文集. 01-9. 377-378 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 高見, 桑木, 平賀: "曲がり管内旋回乱流の減衰"日本機械学会中国四国支部総会講演論文集. 025-1. 237-238 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 高見,柳瀬,丸山,荒木: "旋回かく乱による曲がり管内乱流の抵抗減少"日本機械学会論文集(B編). 66・644. 997-1003 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 高見,柳瀬,丸山,荒木: "曲がり管内旋回流れの壁面剪断応力測定と抵抗減少"第37回日本伝熱シンポジウム講演論文集. III. 811-812 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 高見,丸山,荒木,清水: "MEMSによる管内乱流の壁面剪断応力測定"日本機械学会徳島地方講演会講演論文集. 005・2. 97-98 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 高見,柳瀬,丸山,荒木,清水,平賀: "曲がり管内旋回乱流の流動抵抗"日本機械学会中国四国支部第39期講演会論文集. 006・1. (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 高見,山崎: "曲がり管内旋回流れの壁面剪断応力測定"日本機械学会1999年度年次大会講演論文集. IV. 141-142 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 高見,荒木,清水,上林: "曲がり管内の強い旋回流れ"日本機械学会長崎地方講演会講演論文集. 998-3. 61-62 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 高見・柳瀬・丸山・荒木: "旋回かく乱による曲がり管内乱流の抵抗減少" 流体力学講演会講演集. 第30回. 121-124 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Takami,Yanase,Maruyama and Araki: "Drag Reduction of Turbulent Flows in a Curred Pipe due to the Swirling Instability" Proceedings of the 4th KSME-JSME Fluids Engineering Conference. 665-668 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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