摘要
本文对水轮机固定导叶和活动导叶后卡门涡进行了系统的研究。研究中使用非结构化网格对流动区域进行离散,这种方法保证了计算网格形态良好,从而提高了计算精度。在对影响卡门涡频率敏感的分离位置计算中,使用了差分方法进行紊流边界层计算,确定分离位置。通过卡门涡频率预估模型对岩滩水电站水轮机固定导叶和活动导叶后的卡门涡频率进行了计算,计算结果与实测结果一致。本文建立的水轮机固定导叶和活动导叶后卡门涡频率预估模型,可在设计阶段进行叶片绕流卡门涡频率的预估。
In this paper, we studied the Karman vortices after stay vane and guide vane for hydraulic turbines. In the flow analysis, the Unstructured Mesh was used to fit complex geometry shape. The Unstructured Mesh will assure the mesh with good shape in calculation domain, accordingly the result accurate can be improved. Shedding frequency is calculated greatly depend on the separation point so that the separation point is precisely obtained is important to the numerical result. The boundary layer calculation method was used in the paper to decide the separation point. Detailed flow analysis and shedding frequency calculation were carried out for different operating range under different water head for the Yantan hydropower station. The calculated shedding frequency agrees well with the test data. The vortices shedding frequency calculation model proposed by this paper can be used to predict the shedding frequency of the Karman vortices for hydraulic turbines design.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2005年第6期729-735,共7页
Chinese Journal of Hydrodynamics
基金
水利部科技创新基金项目(SCX200110)
关键词
水轮机
卡门涡频率
边界层
hydraulic turbines
Karman vortices
boundary layer
