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1. Numerical analysis of Flow-structure interactions with the gravity effect for Rim-generator turbines | |||
CHEN Funan,CHEN Qifan,WANG Zhengwei | |||
Energy Science and Technology 17 May 2017 | |||
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Abstract: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. | |||
TO cite this article:CHEN Funan,CHEN Qifan,WANG Zhengwei. Numerical analysis of Flow-structure interactions with the gravity effect for Rim-generator turbines[OL].[17 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4730359 |
2. Straight flow turbine runner hole-shape rim seal design based on CFD | |||
CHEN Qifan,CHEN Funan,WANG Zhengwei | |||
Energy Science and Technology 11 May 2017 | |||
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Abstract:Since its advantages of the straight passageway and large mass-flow ratio, the straight flow turbine has become an important type in the development of low-head hydraulic resource. However, due to the special configuration of its runner, that the runner rim rotating follows the blades, high demands is required on its runner rim seal performance. Rim seal defects restricted the application and development of the straight flow turbine for many years. By redesigning a hole-shape rim seal using the commercial CFD software, this paper discussing the influence of different hole-shape parameters on the rim seal performance by an orthogonal experiment. Through the analysis, the hole-shape rim seal reduce 20% leakage compared with using the plate clearance seal. ????? | |||
TO cite this article:CHEN Qifan,CHEN Funan,WANG Zhengwei. Straight flow turbine runner hole-shape rim seal design based on CFD[OL].[11 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4730434 |
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