Anti-crack Kaplan turbine blade and design method

By using additively manufactured stress-reducing transition bodies in the blades of propeller turbines, the stress transmission path was optimized, the blade cracking problem was solved, the operational reliability and overhaul interval were improved, and the rigidity and strength of the blade structure were enhanced.

CN122061907APending Publication Date: 2026-05-19CHONGQING WATER TURBINE WORKS
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Patent Information

Application Number
CN202610157280.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-04
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

Propeller turbine blades are prone to cracking during long-term operation, especially as the unit capacity and runner diameter increase, this problem becomes more prominent. Existing improvement solutions cannot achieve long-term stable operation, leading to frequent overhauls and maintenance, increasing operation and maintenance costs and affecting unit availability.

Method used

Additive manufacturing technology is used to connect a stress-reducing transition body between the blade body and the hub body. The design of the space is equal in height and fillet parameters to optimize the stress transmission path. The additively manufactured transition body strengthens the rigidity of the blade-hub junction and avoids stress concentration.

Benefits of technology

It effectively reduces stress in the high-stress area of ​​the blade, prevents crack formation, increases the overhaul interval by more than double, enhances the bearing capacity of the blade root, solves local damage caused by water flow turbulence, and improves operational reliability.

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Abstract

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.
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