冲击式水轮机斗叶根部型线优化设计

摘要

With multiple nozzles and high head Pelton turbines, the increasing of nozzles will lead to mutual interference of flows in the runner, which reduces the efficiency of Pelton turbine. The working pressure at the root of bucket will increase obviously, and the safety factor of the hydropower station will be reduced, UG software was used to establish the model of runner bucket. By using CFD technique, the internal flow of a Pelton turbine with six nozzles was numerically simulated. ANSYS software was used to analyze the stress on the bucket, The runner bucket and profile line at the root were optimized. The problem of mutual interference among jets and internal flows was solved after the increasing of nozzles. The intensity and hydraulic performance of Pelton turbines were guaranteed. The designed unit has the characteristics of stable operation and high efficiency.%应用UG软件完成转轮斗叶模型建立,采用CFD技术对多喷嘴冲击式水轮机内部流动进行数值模拟,并结合ANSYS软件对斗叶应力的分析结果,完成转轮斗叶及根部型线的优化,成功地解决了喷嘴数增加后,射流之间、转轮内部流动之间的流动干涉问题,保证了冲击式水轮机转轮的强度和水力性能,使设计的机组运行更加稳定,效率提高.