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1997 Fiscal Year Final Research Report Summary

Cooperative Study on the Mechanics of Vortex Flow

Research Project

Project/Area Number 07045030
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionUniversity-to-University Cooperative Research
Research Field Fluid engineering
Research InstitutionKyushu Institute of Technology

Principal Investigator

NISHI Michihiro  Kyushu Institute of Tech., Mechanical Engng.Dept., Professor, 工学部, 教授 (80038588)

Co-Investigator(Kenkyū-buntansha) ASH Robert L.  Old Dominion Univ., Professor, 工学部, 教授
UNO Mitsuo  Kyushu Institute of Tech., Mechanical Engng.Dept., Res.Asso., 工学部, 助手 (60142353)
史 峰  九州工業大学, 工学部, 非常勤研究員
TSUKAMOTO Hiroshi  Kyushu Institute of Tech., Mechanical Engng.Dept., Professor, 工学部, 教授 (50117305)
SHI Feng  Kyushu Institute of Tech., Mechanical Engng.Dept., Res.Assoc.
Project Period (FY) 1995 – 1997
KeywordsVortex Flow / Vortex Structure / Vortex Method / Longitudinal Vortex / Vortex Generator Jet / Spiral Vortex Core / Pressure Fluctuation / Flow Control
Research Abstract

In order to carify various facets of vortex theoretically and experimentally, three years research program entitled "Cooperative Study on the Mechanics of Vortex Flow" has been carried out successfully based on the idea to promote both a related individual study made by each of researchers engaging this program and cooperative studies made by the several researchers between Kyushu Institute of Technology and Old Dominion University. Major contributions for this fiscal year are as follows :
1. A collaborative study to clarify experimentally the behavior of longitudinal vortex generated by an inclined weak jet issued from the wall was made using a cirsular pipe and a 14 deg conical diffuser together with a three-dimensional hot-wire velocimeter. It is noted that the nonuniform decay of the vortices generated by the jets was predominant in the latter case. Further experiments show that the vortex generator jet (VGJ) method is effective to control the separation in a diffuser, and they provide the useful information on the various parameters for designing VGJ.
2. A longitudinal vortex generated by a jet in a pipe is also confirmed numerically in the results with coarse grids, though further refinement of the computation is desirable.
3. A quasi 3-D mathematical model for a spiral vortex core in an axisymmetric conduit was demonstrated to calculate both axial and peripheral components of velocity in the flow with swirl. Its usefulness is examined by the comparison between the experiment and the calculation.
4. A new measurement method for fluctuating wall-pressure has been developed by using pressure conductive rubber sheet. Further development will be expected by its application to various vortex flows.
5. Concerning the unsteady flow in a turbopump, it is shown that the reasonable prediction will be made by a numerical analysis based on the vortex method.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] NISHI Michihiro: "Control of Separation in a Conical Diffuser by Vertex Generator Jets" JSME International Journal,Ser.B. 41・1. 233-238 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] QIN W. TSUKAMOTO Hiroshi: "Theoretical Study of Pressure Fluctuations Downstream of a Piffuser Pump Impeller -Part 1" ASME Journal of Fluids Engineering. 119・3. 647-652 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] TSUKAMOTO Hiroshi SHI F.: "Unsteady Navier-Stokes Simulations of Rotor/Stator Interaction within a Diffuser Pump" 九州工業大学サテライト・ベンチャー・ビジネス・ラボラトリ-年報. 1. 30 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宇野 美津夫: "圧力分布センシングシステムと変動圧力場計測" ターボ機械. 25・6. 310-319 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] ASH Robert L.: "Numerical Simulations of Commercial Aircraft Wakes Subjected to Airport Surface Weather Conditions" Journal of Aircraft. 35・1. 18-26 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] WANG Xinming NISHI Michihiro: "Analysis of Swirling Flow with Spiral Vortex Core in a Pipe" JSME International Journal. 41. (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] NISHI M., et al.: "Control of Separation in a Conical Diffuser by Vortex Generator Jets" JSME International J., Ser.B. 41-1. 233-238 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] QIN,W.& TSUKAMOTO,H.: "Theoretical Study of Pressure Fluctuations Downstream of a Diffuser Pump Impeller-Part1" ASME J.Fluids Engng.119-3. 647-652 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TSUKAMOTO,H.& SHI,F.: "Unsteady Navier-Stokes Simulations of Rotor/Stator Interaction within a Diffuser Pump" KIT S.V.B.L.Annual Rep.1. 30 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] UNO,M., & TSUKAMOTO,H.: "Development of a Pressure Distribution Sensing System for Unsteady Flow Mesurement (in Japanese)" Turbomachinery. 25-6. 310-319 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] ASH,R.L., et al.: "Numerical Simulations of Commercial Aircraft Wakes Subjected to Airport Surface Weather Conditions" Journal of Aircraft. 35-1. 18-26 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] WANG,X., & NISHI,M.: "Analysis of Swirling Flow with Spiral Vortex Core in a Pipe" JSME International J., Ser.B. 41 (under printing). (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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