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Experiment Investigation of Proposed Design Concepts for a High Speed Mini Turbopump

Research Project

Project/Area Number 11650179
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionKYUSHU INSTITUTE OF TECHNOLOGY

Principal Investigator

NISHI Michihiro  Kyushu Inst.Tech., Mechanical Engineering Dept., Professor, 工学部, 教授 (80038588)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Kouichi  Kyushu Inst.Tech., Mechanical Engineering Dept., Research Associate, 工学部, 助手 (00274548)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥3,200,000 (Direct Cost: ¥3,200,000)
KeywordsFluid Machinery / Turbopump / Mini Pump / Hydraulic Performance / Design Concepts / Impeller / Performance Test / Clearance / ポンプ / 性能
Research Abstract

Regarding those turbo-pumps of impeller diameter between several millimeter and 50 mm as mini size pumps, this research project aims to develop the hydrodynamic basis of a mini pump having high performance and applicability. To achieve the objective, we have studied the usefulness and effectiveness of the following proposed design-concepts experimentally and numerically :
(1) Selection of higher driving speed of pump
(2) Selection of semi-open type impeller (without front shroud)
(3) Selection of greater number of blades and blade exit-angle
(4) Selection of exit-to-inlet area ratio of impeller less than 1
From two years' research work, the following major conclusions are obtained :
1. It is clarified that a mini turbopump having the internal efficiency greater than 60 % is possible. It is noted that this value is greater than that shown in various textbooks.
2. Experimental results indicate that the slip factor takes the value larger than 0.9 and the greater power input will be possible by u … More se of the present design concepts for mini pump.
3. The similarity law is observed in the pump characteristics for a rotational speed greater than 4,000 rpm. This speed corresponds to the Reynolds number being 1.2 × 10^5, which almost agrees with the description shown in the literatures. Thus, a high speed pump is desirable for the mini size from the viewpoints of not only the Reynolds number effects but the reduction of loss fraction of mechanical seal.
4. It is shown that the numerical turbulent flow analysis based on Reynolds Averaged Naiver Stokes equations with k-ω turbulence model will be reasonably applicable to study the hydraulic performance of mini impeller.
5. The effect of axial clearance between the impeller tip and the casing wall on the hydraulic performance is satisfactorily predicted by the analysis.
6. The bypass method to return some amount of flow from the exit of the pump to the suction pipe is usable to some extent to improve unstable Q-H curve in the low flow region.
7. Though the present test results showed that the pump efficiency of closed impeller (with shroud) was better than that of semi-open impeller (without shroud), the further study is expected to explain them reasonably.
8. It is confirmed from the present experimental and numerical study that the hydraulic performances including the axial clearance effect will be varied greatly depending on design methods, even if we selected the nearly identical specific speed and diameter. Less

Report

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

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 西道弘: "高速・ミニ・ターボポンプの性能に関する研究"九州工業大学S.V.B.L.年報. 3. 29-32 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 西道弘: "高速・ミニターボポンプの性能に関する研究"九州工業大学S.V.B.L.年報. 4. 34-39 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] LIU Shuhong: "A Study on a High Speed Mini Turbopump (2nd Rep : Effect of By pass Flow on the Pump Performance)"Proceedings of 2nd Int.Symp.on Fluid Machinery and Fluid Engng.. 633-636 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] LIU Shuhong: "Impeller Geometry Suitable for Mini Turbo-pump"Proceedings of ASME FED SM'01. 318. 18238(1-8) (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Michihiro NISHI: "A Study on the Performance of High Speed Mini Turbopump"Annual Report of KIT S.V.B.L.. 3 (in Japanese).. 29-32 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Michihiro NISHI: "A Study on the Performance of High Speed Mini Turbopump"Annual Report of KIT S.V.B.L.. 4 (in Japanese).. 34-39 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shuhong LIU: "A Study on a High Speed Mini Turbopump 2nd. Rep. : Effect of Bypass Flow on the Pump Performance"Proceedings of 2nd International Symposium on Fluid Machinery and Fluid Engineering. 633-636 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shuhong LIU: "Impeller Geometry Suitable for Mini Turbo-pump"Proceedings of ASME FEDSM'01. 318 (under printing). 18238/1-8 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 西道弘: "高速ミニターボポンプの性能に関する研究"九州工業大学S.V.B.L.年報. 4. 34-39 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] LIU Shuhong: "A study on a High Speed Mini Turbopump (2nd Rep : Effect of Bypass Flow on the Pump Performance)"Proceedings of 2nd Symp.on Fluid Machinery and Fluid Engineering. 1. 633-636 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] LIU Shuhong: "Impeller Geometry Suitable for Mini Turbo-pump"Proceedings of ASME FEDSM'01. 318. 18238/1-8 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 西 道弘: "高速・ミニ・ターボポンプの性能に関する研究"九州工業大学S.V.B.L.年報. 3. 29-32 (1999)

    • Related Report
      1999 Annual Research Report

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

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