Numerical Simulation Of Hydraulic Machinery Blades' Airfoil And Runner

Hydraulic machinery as general machinery, takes an important role in the national economy. The characters of hydraulic machinery affects the construction expense, characters,function and maintenance cost of the project directly.Runner is the core of hydraulic machinery, so the research of the aerofoil of its vane and forecasting the characters of hydraulic machinery not only has theory significance, but also has practical value in the projects. The characters of hydraulic machinery affects the construction expense, characters,function and maintenance cost of the project directly.In the thesis ,we have researched the hydrodynamic characters of the vane and its aerofoils.The passage has set up perfect CFD analying models, the numerical simulation used standard k-e model, the physics shape was meshed by unstructured grids and mixing grids . The governing equations were dealt with by means of finite volume scheme, second-order upwind scheme and made a discretization using SIMPLEC algorithm. The aerofoil used velocity inlet , free outflow outlet boundary conditions, The inlet and outlet of pump used press bourandy conditions.From this, we can get the following achievements:1.The lifting force and resistance curves. the five aerofoils' best angles from the vane edge to the wheel hub were 2°, 2°, 0°, -2°and -4°.2.Simulating the model pump that getting from the five aerofoils.The results indicated ,the method was reasonable ,and the Q-H curve of the pump from numerical Simulation was accorded with the trial.3.Under the threee desgined conditions,the press on obverse surface of cascade changes lower gradually from head to tail,but it was opposite on rear surface.The press on the five areofoils all changes quickly on the head,moreover,the difference of obverse surface and rear surface of the head was most evident.It was very inclined to bring negative pressure anear the head of every aerofoil.4.Under the designed work conditions,comparing the single aerofoil and cascade,in the same angle,at the same place,the press on the surface of cascade was higher than aerofoil's.To the same aerofoil, press on obverse surface of cascade was inapparent than the single aerofoil's,but it was opposite on the rear surface.