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RESEARCH ON THE CONDITION TO SET A TAILRACE SURGE TANK |
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| Authors: | ZHAO Gui-lian YANG jian-dong State Key Laboratory of Water Resources Hydropower Engineering Science Wuhan University Wuhan China XU Yuan-jie School of Civil Architectural Engineering Wuhan University Wuhan China LI Jin-ping State Key Laboratory of Water Resources Hydropower Engineering Science Wuhan University Wuhan China |
| Affiliation: | ZHAO Gui-lian,YANG jian-dong 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 LI Jin-ping State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China |
| Abstract: | 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. |
| Keywords: | water-column separation tailrace surge tank critical tailrace length first-phase water hammer last-phase water hammer |
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