不对称输水水力控制研究

Study on Hydraulic Control of Asymmetric Water Transfer

分段低压输水方式已成功应用于昆明掌鸠河调水工程,而且这种输水方式也正被南水北调天津干线所采用。除了有其多方面的优点外,也注意到这种方式使水力控制引起的非恒定流现象复杂化,尤其在工程运行较为关注的不对称输水,即全线其中的一线或多线停止输水、恢复输水,不仅在下游会引起激烈的水体振荡,而且将影响其余并联孔的正常运行。采用特征线法编制不对称输水水力控制数学模型,对南水北调天津干线进行变孔数运行控制分析,讨论连续开、关闸的操作方式,并在开、关闸时间间隔上进行优化。

The way of stepped low-pressurized water delivery has successfully been used in the project of Kunming Zhangjiu River water diversion and it was adopted by the Tianjin Main Line of the South-to-North Water Transfer Project recently. With lots of benefits, however, there is much concern about that it makes the phenomenon of unsteady flow much more complicated which is evoked by hydraulic control, especially on the asymmetric water transfer, which one or more lines of the system stop, or re-start to deliver water. During the run of asymmetric water transfer, it will not only cause seriously hydraulic oscillation, but also influence other lines＇ operation. In this paper, a mathematic model of asymmetric water transfer was built based on the method of characteristic curve, and used for the operation control analysis of the Tianjin Main Line of the project. The way of continuous opening and closing of the gate was discussed and optimized for the time interval between two operations.