Numerical Simulation Of Internal Flow In Low Specific Speed Francis Turbine In Sand Water

In the new century, the energy issue has become a bottleneck restricting long-termeconomic and social development of countries in the world, with the development of industry,the demand for energy is even more urgent, efficient use of energy and sustainabledevelopment of world attention to the key issues. Turbine as the core component of the hydrounits play a very important role in China’s electric power production. China’s hydropowerresources abundant, but the vast majority of the river has high silt content, running on thesurface of the turbine blade often subjected to cavitation and sand abrasion interactiondestruction, leading to deterioration of the turbine performance and reduce the life of powerplant operating costs increased economic decline. Therefore, the study the turbine hydraulicperformance of the internal Sandy Water flow has great economic value.Francis turbine of a hydropower length of the blade as the research object, using CFDsoftware to simulate the pressure and velocity of the turbine in the water and the sandy waterflow field in three-dimensional flow, obtained under different conditions of flow componentsdistribution, analysis of hydraulic performance under different conditions and provide atheoretical basis for research and optimization design with sand water turbine wear. Specificsteps are as follows:1. In accordance with the actual data of the original flow of the design drawings andassociated power plant operation, the use of three-dimensional modeling software UG eachturbine flow passage components for modeling.2. Turbine flow passage components each model is built, and then import it intomeshing software which, respectively, of its corresponding mesh.3. With the computational fluid dynamics software, under the conditions of the waterflow field, select three typical flow conditions inside the turbine flow numerical simulation.4. The use of computational fluid dynamics software for full passage of numericalsimulation on the the sandy water flow under different particle concentration and particle size,and then the hydraulic performance of the various components of the length of Francis turbineblades and comparative analysis of the calculation results obtained sand abrasion andcavitation damage law.