Abstract
The control mechanism of the Kaplan turbine is quite complex, and many of the failure cases of the control mechanism have been reported. The present work analyzed a failure case of the blade lever based on the multibody mechanics and fluid-structure interaction method. The flow characteristics in 49 operating conditions are simulated, and the pressure on the runner surface is applied on the FEM model. A dynamic stress isoline is proposed to carry out an in-depth analysis of the failure reason of the blade lever in full operating conditions. The fracture of the blade lever could be attributed to long time operation in high dynamic stress region, which leads to the accelerated fatigue damage. Results in this paper could be helpful for the design, operation and maintenance of the Kaplan turbine.
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