峡江水电站大型灯泡贯流式水轮机技术

介绍了峡江水电站的水轮机参数、水力设计及模型试验和结构设计特点。在水力设计方面,采用最先进的CFD计算软件,对过流部件进行优化,特别是转轮叶片,改进叶片进口头部的脱流,提高大流量区的效率及低水头的出力,并通过模型试验进行了验证。为了保证机组整体结构安全性,进行了大量的计算,包括对重要部件进行有限元分析。转轮采用缸动式结构,转轮室叶片转角范围内采用整体不锈钢板模压,并对筋板进行加强。主轴密封采用了可靠的盘根径向密封。导水机构采用弹簧连杆结构,单作用接力器,在重锤重力作用下关机,保证机组的安全性。

Technology on Large-sized Bulb Tubular Turbine, Xiajiang Hydropower Station

In this paper,turbine parameters,hydraulic design and model test,and turbine structural design features of Xiajiang Hydropower Station are described.In the hydraulic design,the most advanced CFD software is applied to optimize components for flowing capacity.Especially the runner blade,its flow rejection at the blade inlet head is improved,increasing efficiency at high discharge range and output at lower head.This is verified through model test as well.A lot of calculations are executed to assure safety of the integrated structure of unit including finite element analysis carried out on key components.The cylinder-motion structure is applied to the runner.In range of the blade angle,the runner chamber is moulded by integrated stainless steel plate as well as rib plate is strengthened.The main shaft sealing applies reliable radial sealing with stuffing.The water guide mechanism applies spring tie structure with single-function servomotor.Accordingly,the turbine is shut down by heavy hammer so that the unit safety is assured.