Computational analysis of vortex rope in a hydroturbine of Tucuruí dam
| Autor: | Giordane J. Antunes Junior, Erb F. Lins, Adry K. F. Lima, Jerson Rogério Pinheiro Vaz |
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| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Finite volume method Suction Turbulence Mechanical Engineering Applied Mathematics General Engineering Aerospace Engineering 02 engineering and technology Mechanics Vortex shedding Turbine Industrial and Manufacturing Engineering Physics::Fluid Dynamics Vibration 020901 industrial engineering & automation Automotive Engineering Duct (flow) Transient (oscillation) Geology |
| Zdroj: | Journal of the Brazilian Society of Mechanical Sciences and Engineering. 42 |
| ISSN: | 1806-3691 1678-5878 |
| Popis: | There is a relevant hydraulic potential in Amazon rivers, from which it is generated most of the energy available for the largest part of Brazil. One of the most important hydropower plants in the Amazon is Tucurui dam, which can produce 8370 MW through Francis turbines. This kind of turbine often presents hydrodynamic issues due to the vortex rope formation, which can induce vibrations and reduce assembly operating life. The present work concentrates in a computational study to determine the frequency pressure fluctuations in a hydraulic generation unit of the Tucurui hydroelectric power plant. A numerical technique is applied for modeling the turbulent flow throughout the generation unit in a transient regime using finite volume method. For the analysis of velocity and pressure fields on the hydrogenerator, a 3D fully turbulent transient modeling for characterizing the pressure fluctuations at the runner outlet is performed. The structure of vortex rope formed is investigated in order to evaluate the hydrodynamic phenomena resulting from the turbine operating condition. Low-frequency pressure pulsations are caused by the movement of the vortex rope at the runner outlet. Additionally, vortex shedding dynamics is heavily influenced by the turbine operating conditions, demonstrating the importance of such investigation. For 63% distributor opening, the structure of the vortex rope reaches a big size in the suction duct, increasing the possibility of vibration. For 89% distributor opening, the turbine operates under overload condition, and the vortex rope becomes unstable. Comparisons with field data show the efficiency and validity of the numerical modeling, demonstrating good agreement. |
| Databáze: | OpenAIRE |
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