Study On A New Type Of Multi Nozzle Turgo Turbine Hydraulic Model

The development of the national economy cannot do without the power industry,hydraulic power plays a special role in the electric power industry, The water turbine is theheart of power station, leading the economic benefits of the power station. With thedevelopment of science and technology, researchers are not satisfied with the status quo,development and design of hydraulic turbine is more demanding. In recent years China in thedesign and construction of hydropower turbine has made significant achievements. With thedevelopment of hydropower resources, hydropower station construction towards super highwater head and super low head two directions, For the high head hydropower station,weusually adopt high head impulse turbine, For the hydropower resources is not sufficient place,The impact type, mixed flow models can not meet the expected requirements, The mosttradition turgo turbines are single nozzle, turgo turbine single nozzle has certain limitation,unit power output is relatively small, the flow through the runner is low, To achieve theoutput can only increase the number of units, it can also increase the area of plant covers, alsoimproves the power plant construction cost.Based on the high performance multi nozzle inclined study on hydraulic model design ofturbine will find, with the increase of the number of nozzles, complex structure, increased byrotary flow, Jet nozzle shoot and the flow from internal exist interference phenomena to acertain extent, At the root of the blade will produce a large number of vortex, at the same timein the blade inlet also will form a large number of vortex, it can do a lot of damage to theblade, cause the big hydraulic loss of units, lead low hydraulic efficiency. By optimizing andimproving, transfer the original single nozzle into the double nozzle structure, Completehydraulic and structure design of double nozzle turgo turbine runner, three-dimensionalmodeling using UG software, Gambit software carries on the grid division, Finally we useCFD technology to the internal flow of the hydraulic turbine runner is studied by numericalsimulation, to study the internal flow law, Can be seen that the interference between therunner and jet flow is, according to the optimization of the bucket type line, Make up a singlenozzle turgo turbine output is restricted, nozzle number is increased effectively solves theproblem of the flow between the internal jet and the flow interference problem, Finally thefeasibility of double nozzle turgo turbine runner, The turbine can improve the efficiency ofthe turbine runner, safe and smooth operation, At the same time, this paper also puts forwardtechnical measures to maintain the installation of technical standards and operation of this type of turbine, the actual production of power station played a certain role in guiding.