Numerical Simulation And Performance Prediction On Internal Flow In Hydraulic Turbine Of Jinping Second-level Hydroelectric Power Station In Sandy Water

As a core part of the hydroelectric system, hydraulic turbine plays a decisive role in theoverall performance of the hydroelectric system. There are numerous sandy rivers in ourcountry, and the damage is quite severe when hydraulic turbine running in Sandy water flow.So, sediment study on internal flow and performance prediction of turbine has high theoreticalsignificance and practical value. Jinping Second-level Hydroelectric power station is a largehydroelectric station, the overflow silt content is high, the research and performance predictionto its hydraulic turbine internal flow appears is necessary. This research based on specifichydrology condition of the Jinping Second-level Hydroelectric power station, focuses on doingresearch work under5operating mode.According to the power stations to establish the parameters of geometric model of Francisturbine runner, and using the numerical simulation of three-dimensional solid-liquid two-phaseturbulence flow model established by CFD software, to study of solid-liquid two-phaseturbulent flow on hydraulic turbine runner was made, and analysis prediction to the hydraulicturbine internal flow and performance through the computed result.Major work completed in this study are as follows:1. According to the hydroelectric power station’s actual parameter, a three dimensionalgeometric model has been built. And import the three-dimension model into Gambit software,to mesh the various parts in turn;2. Solve boundary setting, parameter choices, calculations and other operations withFluent software for hydraulic turbine main components. Import the grid file into the softwareparameters to evaluate various conditions after setting boundary conditions;3. Carries on the post-processing to the result, the pressure distribution and silt of particleconcentration distribution were obtained. Then analyzes the fluid flow and sedimentconcentrations;4. By comparing and analyzing the characteristics of solid-liquid two-phase flowconditions in the turbine, the mobile information of various hydraulic turbine flow parts weregained, forecastes the performance of the hydraulic turbine in the quotas and qualitative twoaspects, and the effect of silt on hydraulic electrogenerating system.