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| For a Rim-generator turbine with a shaft in transversal arrangement, the operating head is low, and the runner diameter is large. Therefore, the fluid field in a runner would be influenced by the gravity. In this paper, the gravity effect on the fluid flow and the flow-induced stress of the runner are investigated by numerical simulations. The full-body channel including the runner, the inlet pipe and the outlet pipe has been established. Firstly, the gravity influence on the fluid flow through the channel is predicted for this turbine. Secondly, with one-way fluid-structure interaction (FSI) method, the finite element analysis of stresses on the blades is performed. The stress distribution on other parts of the turbine is also calculated in this part. Results show that the pressure field in the runner is influenced by the gravity, and the maximum stresses are located at the transition between the blade and the shroud. The maximum stress on the structure is far smaller than the yield stress. |
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| Keywords:Rim-generator turbine; gravity; fluid-structure interaction (FSI) |
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