Model Test And Numerical Simulation Of Downstream Energy Dissipator Of Yingping Hydropower Station

Along with the rapid exploitation of water power resource in west of the country, more and more mid or low-head flood gate dam hinges are appearing. Though the downstream energy dissipation problems of these hinges are not as intricate or prominent as those of high dam hinges, they are always connected with excessive sand, steep river bed and poor erosion-resistive river bed and banks. So these projects have their speciality. In respect that they always need to discharge the bed load and it is difficult to come into certain submergence depth, it is not appropriate to adopt the normal energy dissipation device such as ski-jump energy dissipatior, underflow energy disspator and surface flow energy dissipatior. Whereas the particularity of this kind of projects, it is necessary to carry on the thorough research on idiographic energy dissipation device and erosion control layout to provide scientific references to this or alike power station. Yingping water power station is one typical low-head station built on mountain river and having the peculiarities so you say. As its head hinge lying in the urgent river crook, steep gradient riverbed before the gate and great velocity of flow, so the rationality, feasibility and sciences of the flood gate downstream rapid surface flow energy dissipation adopted by this project are considered more in design. In this thesis, downstream energy dissipation and erosion control problem of Yingping power station is studied in the concrete, building the unitary hydraulic model in the laboratory. The scale of this model is 1:40. The energy dissipation effect of this layout in preliminary design is validated and optimized by model experiment. During the test, setting assistant energy dissipation training frusta is put forward and the energy dissipation problem of the project is well settled. By three-dimensional k ?εdouble equations turbulent flow mathematic model and water-gas two-phase flow model, it is successful to carry out numerical simulation on the field of turbulent flow of recommended scheme, and elicit the distribution law of flow field velocity, press, and etc. Contrastive analysis indicates that the results of numerical simulation and model experiment tally well. It is further verified the veracity of physical model test and the rationality, feasibility and sciences of the choosed scheme. The research in this thesis successfully resolved the downstream energy dissipation and erosion control problem of Yingping water power station, and thoroughly studied the hydraulic characteristics of the training frusta, which offers certain reference values for similar project problems.