宽浅式尾水渠体型设计  

Configuration Design of Wide-Shallow Tailwater Channel

作　　者：彭勇[1] 张建民[1] 许唯临[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,成都610065

出　　处：《长江科学院院报》2007年第4期1-4,共4页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(50479062)

摘　　要：采用一维和三维k-ε紊流数值模拟方法相结合,对宽深比达到500∶1的尾水渠水流流场进行了模拟。利用一维计算速度快的优点对30个尾水渠体型共60组工况进行了水面线计算,对壁面糙率进行了敏感性分析,提出了满足设计要求、工程量最省的体型。利用三维k-ε数值计算能得到详细流场的优点,分析了不同机组开启时尾水渠内流速分布和水面特性。研究结果表明:推荐方案在小流量时能满足尾水管出口的埋深,在大流量时保证设计有效发电水头且工程量最省。Both the one-dimensional and three-dimensional κ-ε turbulent models are used in this paper to simulate the flow in the shallow tailrace with a ratio 500 ： 1 of width to depth. Water surface profiles of 30 kinds of configuration are computed by one-dimensional model and velocity fields by three-dimensional κ-ε turbulence model. Sensitivity analysis on the effect of roughness of the bed is presented. Relying on above analysis, the shape of the tailwater channel is proposed, which is the most economical and can meet the design requirement. Furthermore, the three-dimensional κ-ε model is used to obtain the detailed velocity fields of the turbulence flows. The flow fields in the tailrace are analyzed on the different conditions of generating units operation. The results show that the recommended program can meet the requirements of the enough submerged depth above the outlet of tail pipe with small discharge and the designed effective power head with large discharge. The recommended cunfiguration is also the most economical program.

关 键 词：宽浅式尾水渠 三维k-ε紊流模型 水力特性 体形优化 

分 类 号：TV135[水利工程—水力学及河流动力学]