RESEARCH ON THE CONDITION TO SET A T

RESEARCH ON THE CONDITION TO SET A TAILRACE SURGE TANK

When using the draft-tube vacuum to be less than 8.0m as the rule to set a tailrace surge tank, a mixing function that describes the process of water-hammer vacuum and velocity-head vacuum varied with time is proposed, on the assumption that the guide vane of the hydraulic turbine and the turbine discharge were all changed linearly. An exact maximum of the draft-tube vacuum for the first-phase water-hammer and the last-phase water-hammer is obtained. Finally a much more reasonable formula of critical tailrace length is derived. The results of two cases show that the formula proposed can determine correctly and reasonably whether a tailrace surge tank is needed or not, and are more suitable for project design than the formula suggested by the specification.

作 者： ZHAO Gui-lian YANG Jian-dong XU Yuan-jie LI Jin-ping   作者单位： ZHAO Gui-lian,YANG Jian-dong,LI Jin-ping(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China)

XU Yuan-jie(School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China) 

刊 名： 水动力学研究与进展B辑  ISTIC EI 英文刊名： JOURNAL OF HYDRODYNAMICS  年，卷(期)： 2004 16(4)  分类号： P7  关键词： water-column separation   tailrace surge tank   critical tailrace length   first-phase water hammer   last-phase water hammer  

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