HYDRAULIC CHARACTERISTIC ANALYSIS OF CHANGING TOP-ALTITUDE TAIL TUNNEL AND ITS APPLICATION
For some hydropower stations with a proper length tail tunnel, if its tailrace level is varied within a certain range, changing top-altitude tail tunnel instead of tail surge tank with large area is a reasonable choice to improve the min. pressure at draft tube inlet section. After the basic differential equations were deduced based on the characteristic implicit model for the transient flow in the changing top-altitude tail tunnel and some complex boundary conditions were built, a unified algorithm tracing the separation point was given combined with characteristic method in pressurized pipeline, improved slot model in channel and mathematical method in state equations. For a given case, the hydraulic characteristic of changing top-altitude tail tunnel was analyzed by this unified algorithm and further comparison was performed with the tail surge tank plan. The results indicate that, for the changing top-altitude tail tunnel, the computational results of its large fluctuation transient process are satisfied with the requirement of regulation guaranteed computation effectively;From the viewpoint of the effect of hydraulic disturb and small fluctuation on operation units stability and regulation performance, it is superior to the tail surge tank plan.
changing top-altitude tail tunnel hydraulic disturb improved slot model small fluctuation two units shared a common tail-tunnel
Jianxu Zhou Qing Su Fulin Cai
Collage of Water Conservancy and Hydropower Eng., Hohai University,Nanjing 210098, China Collage of Water Conservancy and Hydropower Eng., Hohai University,Nanjing 210098,China
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
2074-2079
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）