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Prediction and Guideline for Evaluation of Flow-Induced In-Line Oscillation of a Cylindrical Structure in the Bubbly Flow of the Pipe System.

Research Project

Project/Area Number 11555054
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Fluid engineering
Research InstitutionKanazawa University

Principal Investigator

OKAJIMA Atsushi  Kanazawa University, Faculty of Engineering, Professor, 工学部, 教授 (80013689)

Co-Investigator(Kenkyū-buntansha) SATO Keiichi  Kanazawa Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (50113030)
KAMEMOTO Takashi  Fukuoka Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (30018022)
OKANO Yukimitsu  Institute of Nuclear Safety System, Incorporated, Depute Director General, 技術システム研究所, 副所長
KIMURA Sigeo  Kanazawa University, Faculty of Engineering, Professor, 工学部, 教授 (70272953)
UENO Hisanori  Kanazawa University, Faculty of Engineering, Professor, 工学部, 教授 (80019752)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2000: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 1999: ¥6,500,000 (Direct Cost: ¥6,500,000)
KeywordsFlow-induced vibration / In-Line Oscillation / Circular cylinder / Bubbly flow / Reduced mass damping parameter / Water tunnel / Aspect ratio / Taperd circular cylinder / 円柱 / 数値シミュレーション / 気液ニ相流
Research Abstract

This study are for providing important data to support and develop "Guideline for Evaluation of Flow-Induced Vibration of a Cylindrical Structure in a Pipe" by the Japan Society of Mechanical Engineers, Standard JSME S012-1998. Flow-induced in-line oscillation of a cantilevered circular cylinder model like a thermocouple that is actually used in industrial plants has been experimentally studied by free-oscillation tests in a water tunnel.
Free- oscillation test for a cantilevered model like a thermocouple in a water (a single- phase flow): The response tip amplitudes of a circular cylinder were measured at varying reduced velocity from 1.0 to 4.0. A cantilevered cylinder was supported by plate spring mounted on the water tunnel wall. The aspect ratio of a cylinder was varied from 5 to 21 to investigate the effect of aspect ratio on the response amplitude. It is found that the cylinders with aspect ratio of 5 and 10 show one excitation region, but the cylinders with aspect ratio of 14 an … More d 21 showed two excitation regions. The aspect ratio, therefore, strongly affects the amplitude of the second excitation region. The influence of end-effect also was investigated using cylinders with an end plate attached on the free end. Because the cylinders with an end plate show two excitation regions even if the cylinder has an aspect ratio of 5, the flow around the free end of cantilevered cylinder makes the end-effect. The mechanism of vibration was investigated using a cylinder with a splitter plate in wake to prevent the alternate vortices. The amplitude is bigger than normal cylinder especially at the reduced velocity from 2.3 to 3.0 where the cylinder attached an end plate shows the second excitation region; that is to say, the alternate vortices suppress the amplitude in this range. The maximum amplitude of each excitation region decreases in proportion to the reduced dumping parameter and the amplitude of the first excitation is more sensitive to that parameter. The amplitudes are suppressed in each excitation region when the reduced dumping parameter is greater than 2.5 with each aspect ratio of 10 and 21.
Free- oscillation test for a cantilevered model in two-phase flow: As the fundamental study on flow-induced in-line oscillation of a cantilevered circular cylinder model in two-phase flow, the variations of void fraction, bubble diameter and bubble velocity are measured using an electrical resistivity probe when two-phase flow goes through the region of sudden area expansion in the vertical pipe. In this study two different radial void distributions in the pipe are considered. One is called as sliding flow regime, which occurs when the bubble diameters are less than 5mm. The other is termed as coring flow regime, which takes place when the bubble diameters are greater than 5mm. And the response amplitudes of a circular cylinder have been measured by the free-oscillation tests in the two-phase flow in a water tunnel. Comparing the response amplitudes with the results in a water, we found that the flow-induced vibration are suppressed by the two phase flow. Less

Report

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

    (34 results)

All Other

All Publications (34 results)

  • [Publications] A.OKAJIMA: "Experiments on Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel (1st Report, The Difference of the Response Characteristics When a Cylinder is Elastically Supported and Cantilevered)"JSME International. Journal. 44・4B. 695-704 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.NAKAMURA: "Experiments on Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel (2nd Report, The Influence of the Aspect Ratio of a Cantilevered Circular Cylinder)"JSME International. Journal. 44・4B. 705-711 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.OKAJIMA: "Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel"Proc. of ASME PVP-Vol.420-1, Flow-Induced Vibration-2001. No.01. 351-352 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.NAKAMURA: "A Numerical Simulation and Vortex Structures of In-Line Oscillation of an Elastically Supported Circular Cylinder"Proc. of ASME PVP-Vol.420-1, Flow-Induced Vibration-2001. No.01. 177-184 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 木村繁男: "上昇急拡大円管における気液2相流の流動構造"日本機械学会2001年度年次大会講演論文集. Vol.2. 283-284 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 岡島 厚: "円柱および矩形柱の流れ方向流力振動特性"日本機械学会論文集B編. 65巻・635号. 2196-2203 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Okajima, A.: "In-Line Oscillation of a Structure with a Circular or Rectangular Section"Proceeding of the 3rd Joint ASME/JSME Fluids Eng. Conf. (CDROM), San Francisco, U.S.A.. FEDSM99-7173. 1-6 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Okajima, A., Enya, A.: "Wavelet Analysis of CFD (LES) Results of Vortex Shedding From a Rectangular Cylinder"Proceeding of the 3rd Joint ASME/JSME Fluids Eng. Conf. (CD-ROM), San Francisco, U.S.A.. FEDSM99-7174. 1-6 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Okajima, A., Nagamori, T., Matsunaga, F., Kiwata, T.: "Some Experiments on Flow-Induced Vibration of a Circular Cylinder with Surface Roughness"Journal Fluid and Structures. 13. 853-864 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Shimocha, K., Kimura, S., Okajima, A., Kiwata, T.: "A Study on Rising BubblyFlow through Sudden Enlargement"Proceeding of JSME Hokuriku-Shinetsu Branch Congress 2000 in japanese. No.007-1. 217-218 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Okajima, A., Yasuda, T., Iwasaki, T.: "Flow Visualizations of In-Line Oscillation of a Cylinder with a Circular or Rectangular section"Proceeding of 6th Triennial Int'l Sympo. On FLUCOME. (CD-ROM), FL-048. 1-6 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yamashita, T., Kimura, S., Okajima, A., Kiwata, T: "Two-phase Flow Structure in the Region of Sudden Area Expasion of Vertical Pipe"Proceeding of Mechanical Engineering Congress 2002(in japanese). Vol.II, No.01-1. 283-284 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Okajima, A., Kiwata.T.: "Flow Visualizations of the Wake Pattern of a Rectangular Cylinder Undergoing Flow-induced Streamwise Oscillations"Proceeding of the fifth Asia-Pacific conference on wind engineering. 145-148 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Okajima, A., Nakamura, A.: "Experiments on Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel (1st-Report, the difference on the response characteristics when a cylinder is elastically supported at both ends and cantilevered"JSME International Journal, Series B. Vol.44, No.4. 695-704 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Nakamura, A., Okajima, A., Kosugi, T.: "Experiments on Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel (2nd Report, the Influence of the Aspect Ratio of a Cantilever Cylinder)"JSME International Journal, Series B. Vol.44, No.4. 705-711 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Okajima, A, Kosugi.T., Nakamura, A.: "Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel"Transaction of ASME, Journal of the pressure vessel technology. Vol.124, No.1. 89-96 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.OKAJIMA: "Experiments on Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel(1st Report, The Difference of the Response Characteristics When a Cylinder is Elastically Supported and cantilevered)"JSME International. Journal. 44・4B. 695-704 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] A.NAKAMURA: "Experiments on Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel(2nd Report, The Influence of the Aspect Ratio of a Cantileverd Circular Cylinder)"JSME International. Journal. 44・4B. 705-711 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小杉 崇: "回流水路流中における両端弾性支持円柱及び片持ち弾性支持有限スパン円柱の流れ方向振動"第33回流体力学講演会講演集. 209-212 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] A.OKAJIMA: "Flow-Induced In-Line Oscillation of a Circular Cylinder in a Water Tunnel"Proc. of ASME PVP-Vol.420-1, Flow-Induced Vibration-2001. No.01. 351-352 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] A.NAKAMURA: "A Numerical Simulation and Vortex Structures of In-Line Oscillation of an Elastically Supported Circular Cylinder"Proc. of ASME PVP-Vol.420-1, Flow-Induced Vibration-2001. No.01. 177-184 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 木村繁男: "上昇急拡大円管における気液2相流の流動構造"日本機械学会2001年度年次大会講演論文集. Vol.2. 283-284 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Atsushi OKAJIMA: "Flow Visualizations of In-Line Oscillation of a Cylinder with a Circular or Rectangular section"Proc.of 6th Triennial Int'l Sympo.on FLCOME. FL-048(CD-ROM). 1-6 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 中村晶: "円柱構造物の流体励起振動"J.Institute of Nuclear Safety System. Vol.7. 201-215 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 岡島厚: "円柱構造物の流力振動(回流水槽による2次元模型実験結果)"日本機械学会2000年度年次大会講演論文集. Vol.I. 839-840 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 中村晶: "テーパーのある円柱状構造物の流れ方向振動実験"日本機械学会2000年度年次大会講演論文集. Vol.I. 845-846 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 岡島厚: "円柱構造物の流れ方向流力振動"日本機械学流体工学部門講演会講演概要集. No.00-14. 67-67 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 木村繁男: "上昇急拡大円管における気液2相流の流動構造"日本機械学会2001年度年次大会講演論文集. (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Atsushi OKAJIMA: "In-Line Oscillation of a Structure with a Circular or Rectangular Section"Proceedings of the 3rd Joint ASME/JSME Fluids Engineering Conference. FEDSM99-7173. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 岡島厚: "円柱および矩形柱の流れ方向流力振動特性"日本機械学会論文集B編. 65巻・635号. 2196-2203 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 岡島厚: "矩形柱の流れ方向流力振動特性"日本機械学会1999年度年次大会講演論文集. No.99-1. 473-478 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中村晶: "構造減衰のある円柱の流力振動の数値シミュレーション"日本機械学会流体工学部門講演会講演論文集. No.99-19. 321-322 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Atsushi OKAJIMA: "Flow Visualization of In-line Oscillation of a Cylinder with a Circular or Rectangular Section"Proceedings of the 6th Triennial Int.Sympo.on FLUCOME. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 岡島厚: "円柱構造物の流力振動(回流水槽による2次元模型実験結果)"日本機械学会2000年度年次大会講演論文集. (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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