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Development of New Gas Atomizer Nozzle System for the Production of Fine Metal Powder used in Power Metallurgy

Research Project

Project/Area Number 08555048
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Fluid engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

MASUDA Mitsuharu  KYUSHU UNIVERSITY Interdisciplinary Graduate School of Engineering Sciences, Professor, 大学院・総合理工学研究科, 教授 (40038097)

Co-Investigator(Kenkyū-buntansha) IWAMOTO Katsuharu  Toshiba Co., Chief Engineer, 重電技術研究所, 主査(研究職)
YANO Hidenobu  Interdisciplinary Graduate School of Engineering Sciences, KYUSHU UNIVERSITY Res, 大学院・総合理工学研究科, 助手 (20117279)
AOKI Toshiyuki  Interdisciplinary Graduate School of Engineering Sciences, KYUSHU UNIVERSITY Ass, 大学院・総合理工学研究科, 助教授 (20150922)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥19,100,000 (Direct Cost: ¥19,100,000)
Fiscal Year 1998: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1997: ¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1996: ¥10,200,000 (Direct Cost: ¥10,200,000)
KeywordsPOWDER METALLUGY / GAS ATOMIZER / LASER DIAGNOSTICS / HOLOGRAPHY / TVD ANALYSES / 粉末治金
Research Abstract

In the gas atomization method, the molten metal is atomized by supersonic free jets. However, the breakup process of the melted metal droplet is not known and the industrial atomizer system is designed through the empirical consideration. The aims of the present research are to clarify the breakup process with the laser-based new diagnostic method, to develop the supersonic nozzle with a special exit shape and also to establish the method for numerically predicting the detailed structure of supersonic jets. The following results are obtained.
(1) To observe the breakup process of the water droplet, the novel method is developed. This uses the THG of the Nd : YAG laser (wavelength 355 nm). The inline laser holography system with this ultraviolet laser is constructed and tested with the standard particle with known diameter, and the accuracy of 10% is obtained.
(2) To check the effect of the exit shape of a supersonic orifice on the breakup' of a water droplet, the orifice is made that has 50 micron-wire stretched over the diametrical direction of the orifice. It is found from the holography measurements that this wired-orifice produces water particles with the diameter 10 to 20% smaller than the normal orifice. We believe from this experiment that the droplet size is controllable by changing the exit shape of the orifice or nozzle.
(3) To clarify the detailed structure of the supersonic free jets, the TVD scheme is developed for solving the Euler equations, and the jets with the ratio of stagnation to ambient pressure of up to 1500 are calculated. This scheme is extended to calculated with the boundary fitted grid to increase the accuracy. The three-dimensional calculation scheme is also developed.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Norimatsu,Y.: "Flow Visualization of Supersonic Jet from Sootblower Nozzles" Proc.Int.Conf.on Optical Tech.and Image Processing in Fluid,Thermal, and Combustion Flow. AB049. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Taro Handa: "Fine structure on shock oscillation in supersonic nozzle" Proc.4th KSME-JSME Fluids Engi.Conf.445-448 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hiroshi Katanoda: "Pitot impact pressure of supersonic free jets for sootblower nozzles" Proc.4th KSME-JSME Fluids Engi.Conf.97-100 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 益田光治: "紫外レーザーを用いたインラインホログラフィ法による微粒子計測" 可視化情報. 18・2. 59-66 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 片野田洋: "不足膨張超音速自由噴流の可視化と数値シュミレーション" 可視化情報. 17・2. 85-86 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 樫谷賢士: "軸対称ノズルからの適正膨張超音速層流噴流の構造(ピトー全圧に及ぼすレイノルズ数の影響)" 日本機械学会論文集 B編. 63・616. 3905-3912 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Norimatus, Y.: "Flow Visualization of Supersonic Jet from Sootblower Nozzle" Proc.Int.Conf.on Optical Tech.and Image Processing in Fluid, Thermal, and Combustion Flow AB049. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] HANDA,Taro: "Fine structure on shock oscillation in supersonic nozzle" Proc.4th KSME-JSME Fluids Engi.Conf.445-448 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] KATANODA,Hiroshi: "Pitot impact pressure of supersonic free jets for sootblower nozzles" Proc.4th KSME-JSME Fluids Engi. Conf.97-100 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] MASUDA,Mitsuharu: "Particle sizing with inline laser holograpy using an ultraviolet laser" J.Flow Visualization. 18-2. 59-66 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] KATANODA,Hiroshi: "Visualization and numerical simulation of the under-expanded supersonic free jets" J.Flow Visualization. 17-2. 85-86 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] KASHITANI,Masashi: "Structures of the Correctrly Expanded Supersonic Freejets from Axisymmetric Nozzles (Effect of the Reynolds Number on Pitot Impact Pressure)" JSME Journal. B613-616. 3905-3912 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Norimatus,Y.: "Flow Visualization of Supersonic Jet from Sootblower Nzzles" Proc.Int.Conf.on Optical Tech.and Image Processing in Fluid,Thermal,and Combustion Flow. AB049. (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Taro Handa: "Fine structure on shock oscillation in supersonic nozzle" Proc.4th KSME-JSME Fluids Engi.Conf.445-448 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Hiroshi Katanoda: "Pitot impact pressure of supersonic free jets for sootblower nozzles" Proc.4th KSME-JSME Fluids Engi.Conf.97-100 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Masashi KASHITANI: "Numercal and Experimental Investigations of spersonic Jets from Sootblower Nozzle" JSME International Journal Series B. 41・2. 375-380 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 樫谷賢士: "軸対照ノズルからの適正膨張超音速層流噴流の構造" 日本機械学会論文集 B編. 63・616. 3905-3912 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 宮里義昭: "感圧塗料の発光特性に関する基礎実験" 可視化情報. 17・2. 39-42 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 片野田洋: "不足膨張超音速自由噴流の可視化と数値シミュレーション" 可視化情報. 17・2. 85-86 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] M.Kashitani: "Numerical Analysis of Supersonic Jets from Sootblower Nozzle" Proc.Int.Conf.Fluid Engineering. 2. 931-935 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] M.Masuda: "Measurement of Electron Collision Cross-section in Shock-wave Heated MHD Plasma by an FIR laser" Proc.12th Int.Conf.MHD Electrical Power Generation. 2. 685-690 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 井上雅弘: "レーザー蛍光法によるキャビティのある遷音速内部流れ場の温度揺らぎ測定" 可視化情報. 16・2. 83-86 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 井上雅弘: "レーザー蛍光法による遷音速キャビティ流れ場の三次元構造の測定" 日本機械学会流体工学部門講演会講演論文集. 96・9. 197-198 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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