Contains Sand Hydropower Station Turbine Development Plan With A Hydraulic Model

The computational fluid dynamics-CFD technology has matured in recent years,the applications of it in the turbine model development, research and the internal flowfield analysis are more and more widely. The CFD numerical simulation can obtain thehydraulic turbine interior flow field distribution and various overflow parts interiorflow regime information accurately, provides the technical support for studying thehydraulic performance of hydraulic model turbine，and is the effective means ofdesigning the high performance hydraulic turbine model successfully and optimizing tothe existing turbine.China’s turbine sand wear is very outstanding problems, cause huge economiclosses. Though since the founding focused abrasion mechanism, the abrasion resistantmaterials and the protection measures of experiment research, certain achievementshave been made, but the problem is still not get a satisfactory solution.In addition，theablation degree of discharge apparatus caused by sand is closely allied to the flowcondition．The design theory of hydraulic turbine’s discharge apparatus still not soperfect in the condition of solid-liquid flow，most project designs are based on thepast experience，and modified under the guideline of fair．faced designs theory,as aresult，it can’t promise a stable performance of the hydraulic turbine，which design forworking in loaded streams．Therefore, to develop new wear resistance hydraulic modelstudy is very necessary.The main research contents and creative achievements are as follows:1. The geometric parameters are designed according to the flow channel of thehydraulic model that has similar head and specific speed, as well as the excellentperformance. Using the dualistic Theoryω_u≠0, In accordance with the request thatrunner have the highest speed and conveyance capacity, the higher maximumefficiency and average efficiency, the good cavitations performance, stability and theadaptability for changing work condition.etc. Initial scheme about the runner isdesigned.2、The full-port Francis turbine with complex runner which has been designed aremodeled in three-dimensional solid by using Pro/E software. The three-dimensionalsolid is meshed by ICEM software. The numerical simulation is done to the initialdesign of hydraulic model，and the relevant parts’ geometry size is repaired andimproved through the analysis of the numerical simulation results.3、Through numerical simulation on the different relative setting position of stationary vane and moving vane of hydraulic turbine in silt-laden water flow，and givethe wear resistance performance is good, the relative positions.4、Through the analysis of the numerical simulation on the large flow condition,design condition, small flow condition to the best matching Francis turbine, theinternal flow is given. The results show that the pressure, velocity distribution of thedesign condition are best, and other conditions can meet the expected requirementsbasically.5、 suppose the diameter of grain is fixed,simulate the flow situations ofsolid-liquid media，analyze the difference when the amount and thickness of grain aredifferent，From the simulation results that the concentration of solid particles differentturbine flow components of wear rules is not the same, for specific on the river theoperation of hydropower station, in the design should think about, in order to achieveintegral turbines hydraulic properties is good.6、 A model solution of Francis turbine complex runner which has goodperformance has been designed. The hydraulic performance of it has been estimatedthrough numerical simulation to its49operating point, and they can basically meet thedesign requirement and the expected effect.