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Estimation of characteristics of water jets by means of impact force measurement

Research Project

Project/Area Number 07555333
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section試験
Research Field 資源開発工学
Research InstitutionKumamoto University

Principal Investigator

SUGAWARA Katsuhiko  Kumamoto Univ., Civil Eng., Professor, 工学部, 教授 (60109668)

Co-Investigator(Kenkyū-buntansha) OBARA Yuzo  Kumamoto Univ., Civil Eng., Associate Professor, 工学部, 助教授 (50135315)
岡村 宏  熊本大学, 工学部, 教授 (40040373)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1995: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsWater jet technology / Abrasive jet / Impact force measurement / Water jet cutting / Incident velocity of water jet / Velocity of erosion / ォータージェット / 壊食効果 / 入射速度
Research Abstract

Practical use of high pressure water jets as a tool for rock cutting and drilling has become seriously accepted within the last decade, and the water jet technology is in the improvement stage for practical application. Then, the interest in the cutting mechanism is growing greater, and the precise method to evaluate the structure of water jets impinging onto the rock surface is required for the clarification of the fracture mechanism of rock.
In this research, the impact force that is the resultant force imposes upon a solid target by water jet impinging normally is analyzed to estimate the characteristics of water jet. The obtained results are as follows :
1) The mean velocity of incident jet is determined from the time-average of the impact force measured using a flat target of erosionless, based on the low of momentum.
2) The center depth in the surface erosion period is clarified to increase in direct proportion to the time of impinging, and the erosion speed is proportional to the 6th power of the incident velocity.
3) The theory and experiments shows that the depth of the slot is a function of the nozzle diameter, the driving pressure, the time of exposure, the pressure attenuation constants and the standard erosion pressure that characterizes the objective materials.
4) The erosion speed is proportional to the kinematic energy for ductile materials such as metals, and proportional to the momentum for brittle materials such as fine ceramics.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 竹原孝・菅原勝彦: "衝突力測定による高速水噴流の入射速度とみかけ密度の評価" 資源と素材. 111巻. 457-463 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 竹原孝・菅原勝彦: "高速水噴流の衝突による壊食の噴流速度依存性" 資源と素材. 111巻. 925-930 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 竹原孝・菅原勝彦: "高速水噴流による送り切削のモデリングと考察" 資源と素材. 112巻. 153-160 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 竹原孝・菅原勝彦: "研磨材添加水噴流の流動特性と壊食作用" 資源と素材. 112巻. 707-713 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Takashi TAKEHARA and Katsuhiko SUGAWARA: "Estimation of Incident Velocity and Apparent Density of Water Jets by means of Impact Force Measurement." J.of The Mining and Materials Processing Institute in Japan. vol.111. 457-463 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Takashi TAKEHARA and Katsuhiko SUGAWARA: "Velocity Dependance of The Erosion by Water Jet Impingement." J.of The Mining and Materials Processing Institute in Japan. vol.111. 925-930 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Takashi TAKEHARA and Katsuhiko SUGAWARA: "A Modelling of Slot Cutting with Water Jets and Consideration." J.of The Mining and Materials Processing Institute in Japan. vo.112. 153-160 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Takashi TAKEHARA and Katsuhiko SUGAWARA: "Flow Characteristics and Erosive Action of Abrasive Jet." J.of The Mining and Materials Processing Institute in Japan. vo.112. 707-713 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 竹原孝・菅原勝彦: "衝突力測定による高速水噴流の入射速度とみかけ密度の評価" 資源と素材. 111巻. 457-463 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] 竹原孝・菅原勝彦: "高速水噴流の衝突による壊食噴の流速度依存性" 資源と素材. 111巻. 925-930 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] 竹原孝・菅原勝彦: "高速水噴流による送り切削のモデリングと考察" 資源と素材. 112巻. 153-160 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 竹原孝・菅原勝彦: "研磨材添加水噴流の流動特性と壊食作用" 資源と素材. 112巻. 707-713 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 竹原孝,菅原勝彦: "衝突力測定による高速水噴流の入射速度とみかけ密度の評価" 資源と素材. 111. 457-463 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 竹原孝,菅原勝彦: "高速水噴流の衝突による壊食の噴流速度依存性" 資源と素材. 111. 925-930 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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