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| Influence of different lower edge shapes on surrounding flow field in shut-down process of ring gate |
| Li Luhui, Xiao Juliang, Mo Zhenwei, Wang Gang, Wang Guodong |
| Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin 300072, China |
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Abstract To study the influence of lower edge shapes on the surrounding flow field of the ring gate in the shut-down process, the ring gate of Nansha Hydropower Station has been discussed for an example. There were two common lower edge shape models of the ring gate. Numerical simulation of three dimensional unsteady flow was conducted by using the fluent software with the RNG k-ε turbulence model. The simulation exerted the dynamic mesh and moving mesh focusing on studying the velocity field and the pressure field around the ring gate as well as the bottom pressure distribution under diffe-rent ring gate. By the contrastive analysis, the consequence that the ring gate with a small inclination lower edge has a better performance than with arc-shaped lower edge was got, in the aspects of cavita-tion corrosion, upsetting moment and hydraulic loss et al. However, the ring gate with arc-shaped lo-wer edge has a smaller fluctuation for overturning force and pull force. During the closing process, the bottom pressure distribution has a smaller variation which can prevent hairpin phenomenon effectively. The study will provide theoretical reference for designing and optimizing the shape of the ring gate edge and can be conducive to the stability of the ring gate operation.
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Received: 23 February 2013
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