Numerical Calculation And Experiment On The Unsteady Flow And Navigation Condition In The Long-tail Channel Of Powerstation

With the developing of economic in China, pivotal project has been more and more to comprehensive utilization of water resources in navigable river. The water levels of upstream and downstream at pivot must be reasonable linking-up, which is the important guarantee for the unblocked of navigation in navigable river. So how to solve the matter has been urgent affairs. By using excavated deep long tailrace to solve water levels fall and step of upper and lower, which can solve the matter of navigation, increase generating head of pivot, overcome the effect of water levels elevation to submerge reservoir region and improve the comprehensive utilization of water resources.In this report, in consulting a great deal of domestic and international relevant literature, the contents are studied on the way of numerical calculation, experimental model test by analogical analyzing and summarizing the other similar engineering research achievements. We get plenty of results. the main results include:Firstly, the one-dimensional mathematical model which is applicable to the calculation of a long time and long river section for unsteady flow at hub downstream of the mountain river are developed with the Saint-venant differential equation, adopting Preissmann implicit difference method and verified with the measured data of the experiments reach. in good agreement, And establish foundation for numerical Simulation of influences of hydroelectric power station long tail channel's unsteady flow on navigation condition.Secondly, the waterway regulation structures and techniques on the Angu Hydroelectric Pivotal Project in the Daduhe River show the characteristics of unsteady flow motion and variable laws of related flow factors along downstream channel of the hydroelectric project. The variational rules of four different inflow instances on navigation channel are studied, those can provide the study of navigable channels with base data.Finally, through the study with navigation flow conditions experiment of tailrace, some measures are suggested to improve the effect of navigation flow conditions of tailrace. Good computational accuracy was expressed by four living example, but instances are limited, so the service performance of the formula needed to be argumented further. There are certain engineering applicability and project practical merit of the empirical formula.