Research and Design of the Bulb-Francis Turbine

Runner of the Francis turbine is applied to bulb turbine in this work.Therefore,the basic prinˉciple,hydraulic performance,flow motion law and hydraulic design theory of flow parts of this bulb_Francis turbine are introduced,and the structure design method is put forward.And through analysis and research,it is found that this new type of turbine has advantages of the Francis and Straflo turbine,avoiding their disˉadvantages.Consequently,it can replace the most widely_used modern Francis turbine within wider applicable head range and can be widely used in small and medium_sized hydraulic power station.