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为探究低水头混流式水轮机尾水管扩散段底板抬起角对其性能的影响,结合西南某水电站增效扩容项目,在保证尾水管扩散段上下面角度不变的前提下,拟定了两套扩散段底板抬起角方案,利用相关软件建立了高效区内导叶开度为35°时水轮机的水体模型,并对其进行了流场数值模拟。结果表明,尾水管扩散段底板抬起角对水轮机效率影响不大,对水轮机出力和尾水管回能系数影响较大;随着底板抬起角的增加,相同水头下水轮机出力逐渐减小;在低水头(小流量)时,有适当的底板抬起角比没有时更有利。
In order to explore the influence of bottom lift angle of low-head Francis turbocharger divergence section on its performance, combined with the efficiency expansion project of a hydropower station in southwest China, under the premise of ensuring the upper and lower angles of divergent section of draft tube unchanged, two sets of diffusion The lifting plan of segment floor was established. The water body model of turbine was set up with relevant software when the guide vane opening in high efficiency zone was 35 °, and the numerical simulation of flow field was carried out. The results show that the rise angle of the riser floor has little effect on the turbine efficiency and has a great influence on the output of the turbine and the recovery coefficient of the draft tube. With the increase of the floor lifting angle, the output of the same head turbines gradually decreases. With a low head (low flow), it is more advantageous to have a suitable floor lift angle than when not.