新型双向潮汐发电水轮机组性能优化设计

Hydraulic performance optimization of bidirectional tidal power turbine

根据江厦潮汐试验电站多年运行数据,分析了潮位与运行参数的关系及其变化规律.通过数值模拟分析了双向灯泡贯流式水轮机多工况运行的水力特性,并对原始设计水轮机的灯泡比、导叶安放角、导叶及转轮叶片翼型等进行了优化设计,综合多个设计方案确定了优化后的水轮机整体流道尺寸.对优化设计的机组还进行了模型机组模型验收试验.研究成果直接应用于江厦潮汐试验电站6号机组中,真机的实际运行表明新型水轮机组可实现正反向发电、抽水和泄水等6种工况下的安全稳定运行,正、反向发电效率较潮汐电站中运行的其他机组均提高了6%以上,综合性能得到了提高.

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.