Experimental Research on Stress Fluctuations in Runner Vanes of High-head Pump-turbines

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概要

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• By measuring stress fluctuations in runner vanes of a prototype 500 m class Francis-type pump-turbine and a 1/12 reduced scale model of that pump-turbine, it was revealed that the stress fluctuations consist of (1) components of higher harmonics of runner speed n, (2) components whose frequencies are constant, that is, independent of runner speed, and (3) components caused by interference from the wicket gates. The 1st components are generated by an unequal distribution of flow properties on the periphery of the runner. The 2nd components are estimated as components of acoustic resonance in flow paths very close to the runner. Comparisons of the prototype and the model are made about the overall amplitude and amplitudes of major frequency components of the stress fluctuations.

• 一般社団法人日本機械学会の論文

著者

• Yamaguchi Yuzo

  Mechanical Engineering Research Laboraotry Hitachi Ltd.

• ITO Hideo

  Deputy Chief Engineer, Hitachi Works, Hitachi, Ltd.

• Ito Hideo

  Deputy Chief Engineer Hitachi Works Hitachi Ltd.

関連論文

• Experimental Study of Unsteady Flow Behind a Francis Turbine Runner Exit
• Flying Characteristics of Magnetic Disk Slider with Dust : 1st Report Influence of Dust Adhesion to Slider Rails on Flying Height
• Characteristics of Radial Force Fluctuations on Runners of Francis-type Pump-turbines : Report 1 : Experiments on General Characteristics of Radial Force Fluctuations and Effects of Structural Factors
• Experimental Research on Stress Fluctuations in Runner Vanes of High-head Pump-turbines

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