Numerical realization of Francis turbine blade design and wooden patterns

In the design of Francis turbine runner blade,with the traditional method such as conformal transformation,the design period is quite long and the blade model making is very difficult.In this study the design of the turbine runner blade is improved by integrating the blade mean camberline equation,thickening the blades along the blade mean camberline in flow surface calculation and using the CAD system to draft the wooden patterns of the turbine runner blade.From the wooden patterns it shows that this design method is more optimized and meets the requirement of design better.The shape of runner blade is conformed to the practical one well.It can be used to analyze the the performance of Francis turbine,and to make the wooden patterns machining easier in using programs of numerical controlled machining.