Method to Smooth the 3D Surfaces of the Blades of Francis Turbine Runner


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Abstract


Using CAD techniques to design Francis turbine runner allow a better optimization of the blade shape in the actual context of many hydro-power plant refurbishments that are equipped with runners designed 20…30 years ago. In actual conditions of calculus technique available, the number of calculus sections of the Francis turbine runner blade is between 10…20, so that for a runner having large dimensions (2…10 m, diameter) it does not offer sufficiently good precision for defining pressure and suction side of the blade. Trough proposed method, using cubic spline functions of interpolation, we might find 4…10 more points for defining blade surfaces and the initial calculated points remain unchanged. As well it is an advantage for very precise manufacturing on machine tools with numerical control, and if the runner is monobloc of cast steel it favors exact manufacturing of the casting form. In this way calculus of the smoothness of the blade sections on the stream surfaces can be improved, focusing computing resources to hydrodynamic optimization and afterwards geometrical smoothness of the entire domain can be made done using this method. In the paper are presented, using a concrete example, the stages, the considerations and the modalities of application of this method. The method can be applied at centrifugal pumps and axial hydraulic machines too.
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Keywords


3D Surface; Blade; Francis Turbine Runner; Method; Smooth; Spline

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References


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