Layout and shape of layered pressure reducing control gate in the middle segment of the Yangtze-to-Hanjiang River Water Diversion Project
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Abstract:
The control plan for the segment of the Yangtze-to-Hanjiang River Water Diversion Project will set the control gate at 164 km to avoid the problem of excessive internal pressure in local segments. The rationality of the overall layout of the tunnel line and the layout and shape of the control gate is demonstrated from the perspective of hydrodynamic characteristics.A hybrid model combining a one-dimensional and three-dimensional mathematical model with a physical model was used for relevant research. The one-dimensional water hammer mathematical model is used to analyed the entire hydraulic transition process of the gate opening and closing process. Through optimization calculations, a relatively optimal gate opening and closing process was obtained, while providing boundary conditions for the three-dimensional mathematical and physical models of the control gate segment. A three-dimensional water air two-phase flow mathematical model and a 1:25 scale hydraulic overall physical model are used to simulate and analyze hydraulic indicators such as flow patterns, water surface fluctuations, and pressure distribution on the overflow surface of the gate chamber and regulating pool. At the same time, a control gate discharge capacity curve is provided for a one-dimensional mathematical model.The experimental research results indicate that when the control center hole arc door is opened with a three-stage variable speed process of slow first and then fast, the maximum water hammer pressure value of the entire line can be kept within the allowable range of the regulations; The pressure distribution on the overflow surface of the middle hole is normal, and the energy dissipation of the water in the regulating pool is sufficient. The water surface fluctuation at the inlet front of the lower pressure tunnel is small, and no adverse flow patterns such as suction vortices are observed.The overall plan of adopting segmented layered pressure reduction control in this project is feasible, and the layout and shape of the control gates are reasonable. The research method can be used as a reference for similar projects.
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