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On the influence of the Kaplan turbine runner thickness on its stress parameters [Elektronski vir]
Markov, Zoran ...
The current trend in the design and refurbishment procedures of the hydraulic turbines focuses on both the hydraulic, as well as the stress analysis of the operation parameters. Of course, very ...useful data during the process of validation of the numerical models is the previous operational data during the lifetime of the unit. In many cases, high stressed areas are damaged. Lack of the measurements makes the solution of the problems and verification of the numerical results very difficult. This work represents an integrated approach in solving hydraulic and structural problems in design (re-design) stage or optimization of an axial hydro turbine. Computational Fluid Dynamics (CFD) approach is implemented in solving the flow through an axial flow turbine, taking into account all the necessary factors influencing the real unsteady flow. The results from the CFD calculations are used as an input for the performed Finite Element Analysis (FEA) modelling and structural analysis of the blade. Possibilities for modifications of the blade thickness are analyzed influencing the hydraulic and stress parameters of the turbine. The runner efficiency and strength parameters' changes due to thickness modifications are analyzed.
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