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2002 Fiscal Year Final Research Report Summary

Study of Relationship between Cavitation Light Emission and Erosion in an Orifice Flows

Research Project

Project/Area Number 13650166
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionGunma University

Principal Investigator

TABEI Katsuine  Gunma University, Faculty of Technology, Mechanical System of Engineering, Associate Professor, 工学部, 助教授 (80008466)

Co-Investigator(Kenkyū-buntansha) SHIRAI Hiroyuki  Gunma University, Faculty of Technology, Mechanical System of Engineering, Professor, 工学部, 教授 (00008509)
Project Period (FY) 2001 – 2002
KeywordsCavitation / Orifice / Erosion / Light Emission / Photon Counting / Luminescence / Waterhammer / Image Intensifier
Research Abstract

A relationship between the light emission of an orifice cavitation flow and the caviation erosion is investigated. A very weak light emission can be found in the cavitation flow. For the visualization of the light emission pattern in the flow, CT technique in which Abel transformation is modified is applied. The experiment is systematically performed by changing the conditions of the upstream pressures and orifice diameters. Empirical formula for the cavitation emission intensity is obtained. The damage rate of the cavitation erosion is also measured by a new experiment system, where a copper rod is placed on the axis of the tube through an orifice hole. It is found that the position of cavitation damage slightly deviates from the position of light emission. But the maximum cavitation damage rate strongly relates to the maximum emission intensity. In order to verify the above results in the more complex flow, a similar research is also advanced for the cavitation generated around the c … More ylindrical column on the flat plate
The light emission in the orifice cavitation occurs easily, but it is influenced by the flow pattern and bubble distributions. Hence, a unique experimental method using a water hammer is proposed. The device can generate very high pressure of a water hammer of about 100 atm, The bubbles are instantaneously compressed by the pressure. Then a fairly strong light emission occurs in a tube. It is clarified that the light emission accurately progresses with the shock front of the water hammer. This result is expected to be utilized for the detection of a water column separation in a piping system. Theoretical calculation of a single bubble behavior is performed for the estimation of emission intensity. A theoretical prediction of emission intensity is constructed by using the equilibrium radiation theory considering the ionization and recombination of the atom. Calculation result shows that the light emission is strongly effected not only by the thermal conductivity but also by the ionization energy. Less

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 田部井勝稲, 白井紘行, 益子俊二, 木村忠夫, 高草木文雄, 蜂須賀賢: "オリフィスキャビテーション発光流中の銅ロッドの壊食"日本機械学会論文集. 69-677. 18-24 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Katsuine Tabei: "Erosion of copper rod in a light emission flow of an orifice cavitaion"Transactions of Japan Society of Mechanical Engineers. 69, No.677. 18-24 (2003)

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

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Published: 2004-04-14  

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