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A STUDY ON FLUIDELASTIC VIBRATIONS OF TUBE ARRAYS SUBJECTED TO CROSSFROW IN HEAT EXCHANGERS

Research Project

Project/Area Number 07455101
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Dynamics/Control
Research InstitutionUNIVERSITY OF TOKYO

Principal Investigator

HAYAMA Shinji  INSTITUTION,DEPARTMENT,TITLE OF POSITION UNIVERSITY OF TOKYO,DEPT.OF MECHANICAL ENGINEERING,PROFESSOR, 大学院・工学系研究科, 教授 (00010687)

Co-Investigator(Kenkyū-buntansha) WATANABE Tatsuo  INSTITUTION,DEPARTMENT,TITLE OF POSITION UNIVERSITY OF TOKYO,DEPT.OF MECHANICAL, 大学院・工学系研究科, 助手 (70011179)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1996: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1995: ¥3,200,000 (Direct Cost: ¥3,200,000)
KeywordsVIBRATION OF TUBE ARRAY / FLUIDELASTIC VIBRATION / CRITICAL VELOCITY / HYDRAULIC COEFFICIENTS
Research Abstract

A vast number of papers have been published on the fluid-elastic vibrations of heat exchanger tube arrys subjected to crossflow, in almost all of which the hydrodymanic coefficients necessary to evaluate critical flow velocities are obtained experimentally. In this study it is aimed at obtaining the hydro-dynamic coefficients analytically by using the leakage-flow theory developed by the author. The results obtained are as follows.
1.The measurements of pressure distribution in the streamwise direction in the three-row tube array show that the total pressure drop occurs at the first row. This fact means that the firsst row acts like a row of nozzles in impulse turbines. The minimum pressure occurs at the minimum gap and then the flow separates from the tube walls at about 5-10 degree after the minimum gap. The second row receives velocity energy and the pressure rises just before the minimum gap and then drops again after the minimum gap.
2.Fluid forces acting on a tube in one-row tubes when it vibrates in the row direction are calculated by using the leakage-flow theory and compared with the experimental results obtained by Tanaka. Fairly well agreement is obtained, which confirms the validity of applying the leakage-flow theory for gap flow between tubes.
3.Stability analysis shows that at gap velocity instability is caused by fluid negative damping, and that at high gap velocity whirling mode instability occurs. The latter is caused by velocity-squared fluid-stiffness, where the critical velocities are proportional to the root of mass damping parameters.
4.Resonant pressure pulsations in the stremwise direction occur with high sound level in the duct containing tube array in a certain range of flow rate.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 葉山眞治: "管群によるダクト内主流方向の気柱共鳴" 日本機械学会 機械力学・計測制御講演論文集. Vol.B,No.96-5I. 187-189 (1966)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] SHINJI HAYAMA: "RESONANCES OF STREAMWISE GAS COLUMN IN A DUCT WITH TUBE ARRAY" PRE-PRINT OF JSME,MECHANICAL DYNAMICS,INSTRUMENT AND CONTROL. Vol.B,No, 96-5 I. 187-189 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 葉山眞治: "管群によるダクト内主流方向の気柱共鳴" 日本機械学会 機械力学・計測制御講演論文集. Vol.B No.96-5I. 187-189 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 葉山眞治: "管群によるダクト内主流方向の気柱共鳴" 日本機械学会第73期全国大会講演文集(V). No.95-10. 155-156 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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