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STUDY OF 3-DIMENSIONAL INTERTACTINS BETWEEN WAKE VORTICES AND FLOWS NEAR SEPARATION LINES

Research Project

Project/Area Number 10650895
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Aerospace engineering
Research InstitutionCHIBA UNIVERSITY

Principal Investigator

NISHIKAWA Nobuhide  ENGINEERING Professor, 工学部, 教授 (80009753)

Co-Investigator(Kenkyū-buntansha) MIKAMI Fumihiko  ENGINEERING Research Associate, 工学部, 助手 (40272348)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywords3 Dimensional Separation / Boundary Layer / Lateral Vortex / Unsteady Flow / Turbulence / Visualization / Numerical Simulation / 3-Dimensional Separation / Boundary Lyer / Turbulent / Turbulen / Turoulent
Research Abstract

Three dimensional separated flow over axisymmetric paraboloid at incidence angles ; α=30, 40 and 50 deg has been investigated by three approaches such as particle image velocimetry, numerical study. and measurement with constant temperature anemometer.
Partcle image velocimetry : Supplying tracers with a fog machine or plastic balloons. Laser light sheet is used in studying the structure of the vortices in cross-sections of flow, for which two-color Laser dual sweep has been employed. The user-friendly PIV technique has been developed with separating Argon laser beam into Blue and Green by dichroic mirror, and the flow reversal can be detected. Velocimetry results at α=30, or 40 deg shows at most 20% deviation from the following anemometer results, where Reynolds numbers is 9000 referred to the base diameter.
Numerical simulation : The attempt of numerical simulation of the flow is performed with a pseudo-compressibility method with Beam and Warming method . The results are compared with … More the anemometry experiment. and it was realized that the prediction is good for the 40deg and 50 deg cases where strong vortices appear.
Hot wire anemometry. The flow at the same condition as in PIV study has been investigated experimentally with a hot wire anemometer. Reynolds numbers are 9.0×10^3 and 1.8×10^4 referred to the base diameter. X-type probe has been used to measure three dimensional velocity fields. Velocity fluctuations at sampling time of 4kHz have been also evaluated. The output signals show the change of R.M.S.value and Reynolds stress in various cross-sections and that the spatial correlation factors are small at the locations of large R.M.S.value. Laser light sheet method is used in studying the structure of the vortices in separated flow. The development of lateral vortices in each cross-section of the body is visualized. The variation of vortex patterns is shown for each cross-section, angle of attack and Reynolds number. With both results of anemometry and visualization, it has been confirmed that at large αsuch as 50 deg, the leeside vortex interacts unsteadily with the velocity fluctuations in the wake behind the body. Less

Report

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

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 西川進栄,石出忠輝,三神史彦: "軸対称物体まわりの剥離流の実験と画像速度計測の動向(総説)"日本航空宇宙学会誌、. Vol.48,No.561. 543-548 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 石出忠輝,西川進栄,三神史彦: "大迎角を持つ軸対称放物体背後に生じる剥離渦の非定常特性の解明、"日本航空宇宙学会論文集、. Vol.48,No.562. 377-384 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.ISHIDE,N.NISHIKAWA and F.MIKAMI,: "Experimental Investigation of Three-Dimensional Separated Flow over Body of Revolution at High Angle of Attack,"Proceedingsof of 22nd International Congress of Aeronautical Science. 2-9-6 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.Nishikawa,T.Shimizu,H.Maeda and F.MIKAMI: "Wake Structure around A Decelerated Cylinder"Proc.First Intern.Conf.Computaional Fluid Dynamics. 359-360 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.NISHIKAWA, T.SHIMIZI, H.MAEDA and F.MIKAMI: "Wake Structure around A Decelerated Cylinder"Proc. First Intern. Conf. Computational Fluid Dynamics. 359-360 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.ISHIDE, N.NISHIKAWA and F.MIKAMI: "Experimental Investigation of Three-Dimensional Separated Flow over Body of Revolution at High Angle of Attack"Proceedings of 22nd Intern.Council of Aero-nautical Science. 2-9-6. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] N.NISHIKAWA, T.ISHIDE, and F.MIKAMI: "Review of PIV or Experimental Investigation of Separated Flow over a Body of Revolution (in Japanese)"J.Japan Soc.Aeron.Space Sciences. Vol.48, No.561. 543-548 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.ISHIDE, N.NISHIKAWA and F.MIKAMI: "Clarification of Unsteady Characteristics in Separated Flow over a Axisymmetric Parboloid at High Angle of Attack (in Japanese)"J.Japan Soc.Aeron.Space Sciences. Vol.48, No.562. 377-384 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 西川進栄,石出忠輝,三神史彦: "軸対称物体まわりの剥離流の実験と画像速度計測の動向(総説)"日本航空宇宙学会誌、. Vol.48.,No.561. 543-548 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 石出忠輝,西川進栄,三神史彦: "大迎角を持つ軸対称放物体背後に生じる剥離渦の非定常特性の解明、"日本航空宇宙学会論文集、. Vol.48,No.562. 377-384 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.ISHIDE,N.NISHIKAWA and F.MIKAMI,: "Experimental Investigation of Three-Dimensional Separated Flow over Body of Revolution at High Angle of Attack,"Proceedingsof of 22nd International Congress of Aeronautical Science. 2-9-6 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Nishikawa,T.Shimizu,H.Maeda and F.MIKAMI: "Wake Structure around A Decelerated Cylinder"Proc.First Intern.Conf.Computaional Fluid Dynamics. 359-360 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 石出忠輝、西川進栄、三神史彦: "三次元境界層剥離の可視化と熱線計測"航空宇宙学会論文集、. 48巻553号. 27-33 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Ishide, T., Nishikawa, N. and MIKAMI, F.: "Experimental Investigation of Three Dimensional Separatd Flow over a Body of Revolution at High Angle of Attack"22^<nd> International Council of Aeron. Scis. (August, 2000 England). 発表予定. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] N.Nishikawa & T.Ishide S.Kaminaka,and F.Mikami: "Visualization and Measurementol Flows With Large Vortical Patterns" Flow Visualization. VIII. 170-1,170-6 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N Nishikawa T.Ishiwada and F.Mikami: "Numerical Study of Flow over a Body with Abrupt Change in Translating Velocity" Theoretical and Applied Mechanics,. Vol.47. 223-231 (1998)

    • Related Report
      1998 Annual Research Report

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

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