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| Stress analysis of Francis hydraulic turbine runner based on FSI |
| Xiao Ruofu1, Zhu Wenruo2, Yang Wei1, Liu Jie3, Wang Fujun1 |
| 1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2.Beijing IWHR Technology Co. Ltd., Beijing 100038, China; 3.Department of Mechanic and Electric, China Three Gorges Corporation, Chengdu, Sicuan 610000, China |
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Abstract To carry out stress characteristics analysis based on two-way FSI, the Navier-Stokes equations and Continuity equation used were transferred to arbitrary Lagrangian-Eulerian(ALE)coordinate system firstly, then were discretized with the special finite volume method adopting flow-condition-based interpolation(FBIC-C). The structure static mechanics equations used were established in rotation coordinate system, and were modeled with the finite element method. The two-way coupling ite-ration method between the fluid equations and the solid finite element equations was used to calculate until the coupling system is convergence. The structure calculation results based on two-way FSI showed that: the equivalent stress and deformation distribution of the runner in one-way and two-way FSI conditions are similar. The locations of maximum stress and deformation are the same. With the increasing of deformation, the relative difference of equivalent stresses gets higher. The highest relative difference values of equivalent stresses and deformations are both occurring at the maximum deformation point. Deformation mainly determines the difference between one-way and two-way FSI results. The one-way FSI is available if accuracy requirement is low at the condition of small deformation.
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Received: 05 May 2012
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