Research Of Inner Flow In Diversion Components And Guiding Device Of Hydraulic Turbine Based On Solid-liquid Flow

With the development of computational fluid dynamics and the technology of computing, some CFD software about three dimensional viscous flows are successfully used to analyze the characteristic in internal flow field of turbines. Because the flow within the volute is very complicated, the characteristics of the flow within the volute are known very less presently. At the same time, numeration in the guiding device has obtained some development, but the numeration and analysis on solid-liquid fluid with sediment is still absent, especially the integrated analysis and numerical simulation of coupled computed in diversion components and guiding device. So it is very necessary to study the solid-liquid flow in diversion components and guiding device. After analyzing the physical mechanism and discussing the performance and hydraulic loss of diversion components on the condition of solid-liquid fluid, we can get the optimize measure of it and give the design some advice.The hydraulic design of diversion components and guiding device which are composed by volute, stay vanes and guide vanes is very important to the performance of hydraulic turbine. These components contact and influence each other. The abrasion of diversion components and guiding device from particles is nearly related with the flow in these three components. The design theory of diversion components and guiding device is not perfect, in engineering design many designs base on the experience, use the rinsing design theory to design, then modify it, so the performance of the product can not be guaranteed. To find a new method of studying the solid-quid flow in diversion components and guiding device, in this paper the inner flow in volute, stay vanes and guide vanes is coupling simulated using the N-S equation with the SIMPLE algorithm and three-dimensional mixed element type unstructured grids in the Cartesian space. When transporting the rinsing, use the standard k-∈ model, when transporting the solid-liquid fluid with particles, use κ-∈-AP model. Some conclusions are drawn, they can be used in the optimize design of hydraulic turbine. The main research conclusions are the flowing:1 , The basis theory and numerical solution method of the solid-liquid two-phase tubulent flows are summarized and elaborated systemically.2, Based on the design parameter of NO.2 hydraulic turbine in Liu Jia xia Hydropower Station, create the 3D entity model. With the numerical simulation in the diversion components and guiding device, the different characteristics are found out when transporting rinsing and solid-liquid fluid (with particles), the physical mechanism of solid-liquid flow in these components is analyzed. The performance and hydraulic loss in it are also discussed.3, Through simulating particle erosion and Cavitation damage to diversion components and guiding device when transporting solid-liquid fluid, the conclusion of particle erosion and Cavitation damage is drawn. Comparing to the correlative materials, the results of simulation are in good agreement with the material offered by Hydropower Station, as well as the feasibility of simulation by Fluent is proved.4, Through the analysis and using of Fluent, the shortcomings of numerical simulation are found out, and some development prospects are drawn.