3 results about "Kaplan turbine" patented technology

The invention discloses a high-precision modeling method for an axial-flow Kaplan turbine based on a seagull optimization algorithm and a BP (Back Propagation) neural network. The high-precision modeling method comprises the following steps: acquiring basic modeling data of the axial-flow Kaplan turbine; the opening degree characteristic and efficiency characteristic data of the axial-flow Kaplan turbine are supplemented; constructing a flow characteristic and torque characteristic data set of the axial-flow Kaplan turbine; correcting the guide vane opening degree in the flow characteristic and torque characteristic data set of the axial flow Kaplan turbine; constructing a guide vane and paddle joint characteristic model based on a seagull optimization algorithm and a BP neural network; and in combination with the corrected data set, the BP neural network and a seagull optimization algorithm, reconstructing a flow characteristic and torque characteristic neural network model of the axial-flow Kaplan turbine. According to the axial-flow movable propeller water turbine modeling method considering the modeling data quality and the guide vane and paddle joint characteristics, a high-precision and nonlinear axial-flow movable propeller water turbine model can be obtained, and a model basis is provided for axial-flow movable propeller water turbine unit control strategy research.

This application discloses an apparatus and method for manufacturing Cabran-type turbine blades using electroslag casting, belonging to the field of electroslag casting. A free electrode is disposed in the flange area (including the transition area) and arranged between the guide electrodes of a flexible electrode casting system. The cross-sectional profile of the free electrode is adapted to the cavity of the flange area. The free electrode is held in place by a clamping mechanism to maintain its position or move vertically. For the electroslag casting process of turbine blades with a composite cross-section of "blade + flange," this application solves the problems of electrode transition and consumable electrode design in electroslag casting by introducing a dedicated free electrode for the flange area and coordinating with the flexible electrode casting system for partitioned filling. This enables the manufacture of Cabran-type (through-flow and axial-flow) turbine blade castings, i.e., castings with three-dimensional curved surfaces and large cross-sectional area variations, using electroslag casting, thus expanding the application scope of electroslag casting.

The invention relates to the technical field of water turbine blades, and discloses an anti-crack Kaplan water turbine blade which comprises a blade body and a stress reduction transition body connecting the blade body and a hub body, and the size parameter of the stress reduction transition body is determined based on the diameter D1 of a runner: the equal height value d1 of a pressure side space fillet and the radius value R1 of the pressure side fillet are 0.02 D1 to 0.03 D1, d1 and R1 are not less than 100mm; the equal height value d2 of the space fillet of the negative pressure side and the radius value R2 of the fillet of the negative pressure side are 0.015 D1 to 0.02 D1, and the d2 and the R2 are not smaller than 75 mm. Cracks at the joints of the blades and the hub are avoided, the bearing capacity of the roots of the blades is enhanced, and the problems of root cracks and vibration under the hydraulic action are effectively solved.