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Hydrographic Model Test on Prevention against Vortex Occurrence for Vertical Bulb Turbine

Yamato, Shoichi    (Fuji Electric Systems Co., Ltd.   ); Nakamura, Shogo    (Voith Fuji Hydro K.K.   ); Furukawa, Akinori    (Kyushu University  );
  • 초록

    A vertical bulb turbine unit with elbow type draft tube has been developed due to avoidance of complicated assembling and long standstill period at overhaul in comparison with conventional horizontal bulb turbine unit. Before designing the prototype vertical bulb unit, a hydrographic model test was carried out to establish the ideal design concept for this innovative generating unit. Froude similarity is not available for vortex occurrence. Consequently, an intake structure without air entraining vortices under all the flow conditions is developed, and it is confirmed that the surge wave at load rejection is not affected harmful influence for other constructions.


  • 주제어

    Water turbine .   Air entraining vortex .   Free surface flow .   Surge wave .   Hydrographic model test.  

  • 참고문헌 (14)

    1. Kushima,H. Murata,Y., 2001, The development of Vertical Bulb Turbine and generator, Turbomachinery (in Japanese), Vol. 29, No. 6, pp. 334-340. 
    2. Takahashi, M., Masuo,M., 2001, Vertical Bulb Turbine and generator of Large Size, Electrical Review (in Japanese), Vol. 86, No. 3, pp. 7-10. 
    3. Ishihara, T., 1958, Applied Hydraulics I, (in Japanese), Maruzen, Tokyo. 
    4. Hosaka, M., et al, 2001, Reasonable Design of Inclined Uniforming Flow Plate for Kaminojiri No.2 PS, Electric Power Civil Engineering (in Japanese), Vol. 5, No. 293, pp. 9-13. 
    5. Denny, D. F., 1956, An Experimental Study of Air-Entraining Vortices in Pump Sumps, Proc. Inst. Mech. Engr., Vol. 170, No. 2, pp. 106-116. 
    6. Ogiwara, Y., 1962, Experimental Study of Outflow Vortexes , Research Report of Yamanashi University Department of Technology (in Japanese), Vol. 13, No. 2, pp. 132-139. 
    7. Ogiwara, Y., Toyama, S., 1964, Experimental Study of Outflow Vortexes (2), Research Report of Yamanashi University Department of Technology (in Japanese), Vol. 15, No. 12, pp. 158-168. 
    8. Kamemoto, K., et al, 1996, Effects of Surface-Waves on Air-Entrainment Features due to a Surface-Vortex, Proceedings of the 74th JSME Annual Meeting (in Japanese), Vol. III, No. 96-15, pp. 269-270. 
    9. Shoji, H., et al, 2001, Preventive Measures of Air-Entraining Vortices by the Perforated Board, Turbomachinery (in Japanese), Vol. 29, No. 11, pp. 694-700. 
    10. Tsukamoto, T., 2000, Special Operation of Bulb Turbine, Turbomachinery (in Japanese), Vol. 28, No. 1, pp. 56-59. 
    11. Honma, M., 1957, General Hydraulics, (in Japanese), Maruzen, Tokyo. 
    12. Konno, H., et al, 2002, Basic Design and Works of Vertical Bulb Turbine for Kaminojiri No.2 PS, Electric Power Civil Engineering (in Japanese), Vol. 9, No. 301, pp. 14-19. 
    13. Ohbuchi, M., Tagomori, M., 2006, Water Level Fluctuation in Pump Sump with Coupled Pit and Countermeasures Against Harmful Vortices, Turbomachinery (in Japanese), Vol. 34, No. 8, pp. 471-476. 
    14. Kamemoto, K., 2008, Flow-Induced Vibrations and Formation of Vortices, Turbomachinery (in Japanese), Vol. 36, No. 1, pp. 11-18. 

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