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Experimental analysis of Separated boundary layer & measurement of void-fraction around the airfoil under two-phase flow conditions.

Research Project

Project/Area Number 02805024
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionUniv. of Tokyo

Principal Investigator

ICHIKAWA Yasumasa  Univ. of tokyo, Dept. of Mechanical engineering, Research Associate, 工学部, 助手 (40134473)

Co-Investigator(Kenkyū-buntansha) KAWADA Tastsuo  Univ. of tokyo, Dept. of Mechanical engineering, Research Associate, 工学部, 助手 (00010851)
MATSUMOTO Yoichiro  Univ. of tokyo, Dept. of Mechanical engineering, Associate Professor, 工学部, 助教授 (60111473)
OHASHI Hideo  Univ. of tokyo, Dept. of Mechanical engineering, Professor, 工学部, 教授 (90010678)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1991: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1990: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsVoid fraction / Bubbly flow / Performance of Airfoil / Boundary layer / Separation / Optical fiber / Image processing / Visualization
Research Abstract

The main purpose of this research is to clarify the relation between bubble motion and boundary layer separation in the region of near surface of isolated airfoil. At first, we divided this purpose to next three projects.
1. To measure the void fraction in the boundary layer near the isolated airfoil surface, the new type void fraction meter which consists of optical fiber, buried the airfoil surface is made.
2. The pictures which are bubbles in the flow near the airfoil surface, are took by high speed camera.
3. The bubble motio in the boundary layer near the airfoil surface is clarified.
In the following, the results of each project are described respectively.
l. The new system for measuring of local void fraction I which consist of optical fiber photo electric device, amplifier circuits and personal computer, has exploited. And the ability of this system were studied. But, signal of reflected light from a bubble are very weak and S/N ratio is bad. Therefore, the error measured by this system is larger than the error measured by point electrode prob. More detailed studies must be necessary.
2. The analysis of the pictures showed that the mechanism of the interaction between bubbles and boundary layer, that of slip motion of bubbles near the reading edge and so on. To observe the concentrating process of bubbles Image Processing Software are developed and it was shown to be useful.
3. It is shown that the flow to the main flow direction in separation region are made by bubbles. This is proved by measuring both distribution of pressure around an airfoil and that of pressure on the wall of diffuser.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Yasumasa Ichikawa: ""BUBBLE MOTION AROUND AN AIRFOIL IN BUBBLY FLOW"" FED-Vol.109,Cavitation and Multiphase Flow Forum ASME. 109. 155-158 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大平 昇: "気液二相流中におけるディフュ-ザの性能" 日本機械学会流体工学講演会講演論文集(岡山). 84-86 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ichikawa, Y., Ohira, N., Ohashi, H., Matsumoto, Y.: ""Bubble motion around an airfoil in bubbly flow"" Cavitation and Multiphase Flow Forum. FED-109. 155-158 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ohira, N., Ohashi, H., Matumoto, Y., Ichikawa, Y.: ""Performance of tow-dimensional diffuser in bubbly flow"" Proceeding of Flude Engineering division Conference of JSME in Okayama.84-86 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ichikawa Yasumasa: "BUBBLE MOTION AROUND AN AIRFOIL IN BUBBLY FLOW" Cavitation and Multiphase Flow Forum ASME. FEDーVol.109,. 155-158 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 大平 昇: "二次元ディフュ-ザの気液二相流性能" 日本機械学会流体工学部門講演会論文集. No.910ー50. 84-86 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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