A Two-Dimensional Study of Scale Effects of Flow Oscillation in a Steam Control Valve

DOI Web Site 2 Citations
  • YONEZAWA Koichi
    Department of Mechanical Science and Bioengieneering, Graduate School of Engineering Science
  • NAKAJIMA Toru
    Department of Mechanical Science and Bioengieneering, Graduate School of Engineering Science
  • TOYOHIRA Yosuke
    Department of Mechanical Science and Bioengieneering, Graduate School of Engineering Science
  • MORITA Ryo
    (財) 電力中央研究所狛江研究所
  • TEZUKA Kenichi
    東京電力 (株) 技術開発研究所
  • MORI Michitsugu
    東京電力 (株) 技術開発研究所
  • TSUJIMOTO Yoshinobu
    Department of Mechanical Science and Bioengieneering, Graduate School of Engineering Science

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Other Title
  • 二次元モデルを用いた蒸気加減弁に生じる流体振動のスケール効果に関する研究

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In nuclear power plants, the steam control valves are used to control the flow from the steam generator to the steam turbine under various pressure ratios and openings. Serious flow oscillations can occur due to instabilities of transonic flow through the valve. In the present paper, the two-dimensional study of the flow oscillation in the steam control valve is conducted. The main focus of the present study is the scale effect on the characteristics of the flow patterns. Two sizes of the test models are examined both experimentally and numerically. The result that the frequency of the flow oscillation and the conditions which the flow oscillation occurs are changed by the difference of the size. The frequency is inversely proportion to the height of the duct. The operating range with the oscillation is wider in the larger model than in the smaller model.

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