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| Hydraulic performance optimization of bidirectional tidal power turbine |
| Wang Zhengwei1, Yang Xiaosheng2, Xiao Yexiang1 |
| （1.State Key Laboratory of Hydroscience and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China; 2.China Longyuan Electric Power Group, Beijing 100036, China) |
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Abstract According to the recorded operation data in Jiangxia experimental tidal power station, the relation between the tidal level and the reservoir area water head was analyzed, and the change pattern of the tidal level with the operating parameters was then concluded. The hydraulic characteristics of the bidirectional bulb turbine under multiple operating conditions were investigated by 3D numerical simulation. Based on this, optimization design of a new bidirectional bulb turbine with the fixed flow passage size, including parameters (diameter ratio of runner to bulb, guide vane angle and guide vane/runner blade shape) redesign, was conducted. Key achievement of model units after model acceptance test was also available. The new type unit in Jiangxia tidal power station, unit 6#, in which the research outcome has been directly utilized, achieved stable operating for both forward and reversed generation，pumping and draw off. Moreover, comparing with other units equipped, there is an over 6% efficiency increase for both forward and reversed generation. Besides, turbine general performance has also been improved.
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Received: 03 November 2009
Published: 30 September 2010
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