In the transition process of tailrace system of large hydropower station, there may be the phenomenon of free-surfacepressurized flow. In order to obtain the accurate operating state of constant flow in the free-surface-pressurized flow section, four calculation methods including Runge Kutta method, one-dimensional numerical simulation software, physical model test and three-dimensional flow field analysis software CFD are used to obtain the water surface profile under constant flow conditions. The results show that the calculation results of each method are relatively consistent, indicating that the research method and route are correct and reasonable. The established mathematical model is reasonable and can be used to study the hydrodynamics of free-surface-pressurized flow. Considering the difference between the outlet of tailrace tunnel and one-dimensional simulation method obtained from physical model test and three-dimensional flow field analysis, the water surface lines of the free-surface-pressurized flow section of tailrace tunnel under constant flow conditions obtained by various analysis methods are basically coincident. The analysis of the local flow field at the outlet of the tailrace tunnel shows that it is feasible to use the three-dimensional flow field simulation instead of the physical model test to simulate the more complex working conditions. The research results can provide reference for the design and research of similar water conveyance systems.
In derive analytical formula of the critical stable sectional area of surge tank, toma stable formula, E/N correction formula ignores the influence of the inertial time constant of flow. Considering the inertia of flow, this paper established a hydroelectric generating set with surge of five order analytical model, then using the model, analysis the inertia of flow and the relationship between the critical stable sectional area of surge tank, finally combining with typical hydropower station on the head and flow rate, the sensitivity analysis of channel length.
Pumped-storage power stations have a large number of diversion tunnels, long tunnel lines and frequent changes in the external water level. Based on ansys for simulation calculations, first we simulate the force of the diversion tunnel under different working conditions; then we analyze the stress distribution in the stress cloud diagram; finally we calculate the structural reinforcement of the water inlet/outlet according to the stress cloud diagram, which can meet the requirements of the structure. Therefore, ansys can be used to calculate the diversion tunnels.
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