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2006 Fiscal Year Final Research Report Summary

A Fluid Dynamic Study of Gas Bearing for High Speed Mini-Scale Turbo Machinery

Research Project

Project/Area Number 16206021
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionKYUSHU UNIVERCITY

Principal Investigator

HARA Kazuo  Kyushu University, Faculty of Engineering, Mechanical Science, Research Assistant, 大学院工学研究院, 助手 (00150491)

Co-Investigator(Kenkyū-buntansha) FURUKAWA Masato  Kyushu University, Faculty of Engineering, Mechanical Science, Professor, 大学院工学研究院, 教授 (30181449)
YAMADA Kazutoyo  Iwate University, Faculty of Engineering, Research Assistant, 工学部, 助手 (00344622)
Project Period (FY) 2004 – 2006
Keywordsgas bearing / journal bearing / numerical analysis / bearing number / minichannel / heat transfer enhancement / gaseous cooling
Research Abstract

Research was carried out from the points of view of three terms, which were a flow analysis of gas bearing by way of numerical approach, low speed experimental investigation of scale up model. and heat transfer investigation of air for mini-scale passage.
The numerical investigation was executed for a spindle of 31.8mm diameter,45mm length and radial clearance of 20μ for rotational speed of 10,000,50,000 and 100,000 rpm. Numerical result showed a conventional relationship between non-dimensional load coefficient and bearing number, which represented load capability and rotational speed respectively. Air flowed in and out through the shaft end clearance due to the pressure distribution inside the bearing and was found to contribute to the cooling of the bearing.
A specification of test stand for low speed model test was based on the numerical result. The spindle was designed as 144mm diameter, 100mm length and 0.12mm radial clearance and was driven by an electric motor with static type pr … More essurized bearing. The peripheral velocity of the spindle was 7.5m/s for maximum rotational speed of 1,000 rpm in the experiment. Three high frequency pressure transducer were installed in three axial points of the spindle and the pressure distribution in the peripheral direction of the bearing was measured by phase locked sampling system to decide a bearing number and non-dimensional load coefficient. The non-dimensional load coefficient decreased due to the leakage of air according to the pressure distribution. A seal of leakage air was considered to be important for practical application.
A steep peripheral pressure gradient was created due to the strong shear in the journal bearing. The pressure gradient gave significant effect on the heat transfer characteristics. At the inlet portion of the mini-scale channel of about 1 mm diameter, it was found that heat transfer was greatly enhanced. The heat transfer performance was equivalent to the impingement heat transfer, which was well known to have a high heat transfer performance. Less

  • Research Products

    (8 results)

All 2006 2005 2004

All Journal Article (8 results)

  • [Journal Article] Experimental and Numerical Analysis of High Heat Transfer Phenomen on in Minichannel Gaseous Cooling2006

    • Author(s)
      Kazuo HARA, Masato FURUKAWA, Naoki AKIHIRO
    • Journal Title

      Proceedings of ASME ICNMM2006, 4th International Conference on Nanochannels, Microchannels and Minichannels

      Pages: ICNMM2006-96213

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Experimental and Numerical Analysis of High Heat Transfer Phenomenon in Minichannel Gaseous Cooling2006

    • Author(s)
      Kazuo HARA, Masato FURUKAWA, Naoki AKIHIRO
    • Journal Title

      Proceedings of ASME ICNMM2006,4th International Conference on Nanochannels, Microchannels and Minichannels ICMM2006-96213

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Experimental Investigation of Heat Transfer in Square and Circular Minichannel Air Flow for Wide Range of Pressure Ratio2005

    • Author(s)
      Kazuo HARA, Masato FURUKAWA, Naoki AKIHIRO
    • Journal Title

      Proceedings of ICMM2005, 3rd International Conference on Microchannels and Minichannels

      Pages: ICMM2005-75184

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Role of Inlet Pressure Drop in Minichannel Gaseous Cooling2005

    • Author(s)
      Kazuo HARA, Masato FURUKAWA
    • Journal Title

      Proceedings of The 6th KSME-JSME Thermal and Fluids Engineering Conference

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] ミニチャンネル気体冷却における熱伝達2005

    • Author(s)
      原和雄, 古川 雅人, 井上雅弘
    • Journal Title

      日本機械学会論文集 B編第71巻第704号

      Pages: 1005-1010

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Experimental Investigation of Heat Transfer in Square and Circular Minichannel Air Flow for Wide Range of Pressure Ratio2005

    • Author(s)
      Kazuo HARA, Masato FURUKAWA, Naoki AKIHIRO
    • Journal Title

      Proceedings of ICMM2005,3rd International Conference on Microchannels and Minichannels ICMM2005-75184

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Heat Transfer in Minichannel Gaseous Cooling2005

    • Author(s)
      Kazuo HARA, Masato FURUKAWA, Masahiro INOUE
    • Journal Title

      Transactions of the Japan Society of Mechanical Engineers Vol.71, No.704

      Pages: 1005-1010

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Experimental Study of Heat Transfer Coefficient in Minichannel Gaseous Cooling2004

    • Author(s)
      Kazuo HARA, Masato FURUKAWA, Masahiro INOUE
    • Journal Title

      Proceedings of KAIST-Kyushu University Joint Workshop on Mechanical and Aerospace Engineering

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

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Published: 2008-05-27  

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