Frozen Rotor and Sliding Mesh Models Applied to the 3D Simulation of the Francis-99 Tokke Turbine with Code_Saturne

Tonello, N. A.; Eude, Yohann; Meux, Benoît de Laage de; Ferrand, Martin

doi:10.1088/1742-6596/782/1/012009

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…Frozen rotor coupling method results are compatible with the experimental results. Tonello et al [17] worked on steady-state operation of Francis-99, Tokke turbine at different loads. Simulations are carried out using both the frozen rotor approximation and unsteady sliding mesh technique.…”

Section: Methodsmentioning

confidence: 99%

Rehabilitation of Francis Turbines of Power Plants with Computational Methods

Çelebioğlu¹,

Aradağ²,

Ayli³

et al. 2018

Hittite J. Sci. Eng.

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R ehabilitation of hydraulic turbines of existing power plants is an important topic because of the low performance, poor reliability, frequent maintenance intervals and undesirable cavitation properties of old turbines at the plants. Rehabilitation projects increased worldwide to improve turbine designs and to reach the desired performance characteristics, especially with the improvements in computational power and Computational Fluid Dynamics (CFD) technology. However, rehabilitation of old power plants is often more difficult than the design of the turbines for new power plants since most of the existing parts cannot be altered because some of the parts are buried and the space is limited with the size of the old turbine.Both experimental and numerical methods are common in the design [1] Su et al. [4] computed the three-dimensional turbulent flow in Francis turbines using Large Eddy Simulations (LES). They used unstructured meshes for the spiral case and the runner, while structured meshes were utilized for the remaining components. They found out that cavitation was observed at the suction side of the blade under partial load conditions. Patel et al.[5] also performed three-dimensional, unsteady CFD simulations for Francis turbines. They investigated the effect of partial loading on turbine performance. The A B S T R A C T R ehabilitation of existing hydroelectric power plants (HEPP) by redesigning the hydraulic turbines is usually more elaborate than designing a tailor-made turbine for a new plant. Some of the parts are buried and the space is limited with the size of the old turbine; therefore, this increases the number of constraints imposed on the design. This article presents a Computational Fluid Dynamics (CFD) based rehabilitation procedure involving the state of the art redesign of the turbine of a hydroelectric power plant for better performance at design and off-design conditions of several head and flow rates. Runner and guide vanes of the Francis turbine are designed per the design head and flow rates available for the turbine at the site. The simulations for the designed parts are performed both separately and using all turbine parts as full turbine analyses. Both the design and off-design conditions are simulated for the newly designed and existing turbines for comparison purposes. Cavitation performance of the new design is also determined. The proposed methodology is applicable to any Francis type turbine and any HEPP that needs rehabilitation.

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Section: Methodsmentioning

confidence: 99%

Rehabilitation of Francis Turbines of Power Plants with Computational Methods

Çelebioğlu¹,

Aradağ²,

Ayli³

et al. 2018

Hittite J. Sci. Eng.

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“…In steady state simulations there is not any relative motion between regions, due to the nature of its temporary approach. For this reason, the frozen rotor technique is used, which follows the MRF methodology [18]. The MRF methodology establishes a separated reference frame for each region of the domain, for both rotational and static.…”

Section: Multiple Reference Framementioning

confidence: 99%

Rotatory 3D structured mesh study using openFOAM to simulate the flow in francis turbine

Hidalgo

Velasco

Cando

et al. 2022

Materials Today: Proceedings

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“…e concept of Multiple Reference Frame (MRF) was implemented in simulation over a range of runner speeds to minimize the computational time required because of the longer computational time required for 22 runners. Studies show that the errors are within acceptable margin when compared to Sliding Mesh (SM) method for turbomachinery simulations [31,32]. Tonello et al [32] did a comparative study between SM and MRF approaches for Francis turbine simulation and concluded that SM does not offer a significant advantage over the MRF approach for overall turbine characteristics prediction.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Studies show that the errors are within acceptable margin when compared to Sliding Mesh (SM) method for turbomachinery simulations [31,32]. Tonello et al [32] did a comparative study between SM and MRF approaches for Francis turbine simulation and concluded that SM does not offer a significant advantage over the MRF approach for overall turbine characteristics prediction. Gullberg and Sengupta [31] also suggest that the MRF technique can provide an accurate prediction of turbomachinery performance.…”

Section: Numerical Simulationmentioning

confidence: 99%

Effects of Geometrical Parameters in Gravitational Water Vortex Turbines with Conical Basin

Bajracharya

Shakya

Timilsina

et al. 2020

Journal of Renewable Energy

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Gravitational Water Vortex Power Plant (GWVPP) is an appropriate means to convert kinetic energy of water to rotational mechanical energy at the very low head site. This study aims to establish a basic reference for the design of the runner for the Gravitational Water Vortex Turbine (GWVT) with a conical basin. Seven different geometrical parameters have been identified for runner design, and the effect of these parameters on the system efficiency has been studied numerically and experimentally. The effect of these parameters has been studied over the range of speed with torque. The results from performance tests of these runners suggest that runner height is the most significant parameter to be considered in the design of a turbine runner for GWVPP with a conical basin. The results show that the efficiency of GWVT has improved up to 47.85% as obtained from experiments.

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Frozen Rotor and Sliding Mesh Models Applied to the 3D Simulation of the Francis-99 Tokke Turbine with Code_Saturne

Cited by 7 publications

References 2 publications

Rehabilitation of Francis Turbines of Power Plants with Computational Methods

Rehabilitation of Francis Turbines of Power Plants with Computational Methods

Rotatory 3D structured mesh study using openFOAM to simulate the flow in francis turbine

Effects of Geometrical Parameters in Gravitational Water Vortex Turbines with Conical Basin

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