Simulations of Steady Cavitating Flow in a Small Francis Turbine

Laouari, A.; Ghenaiet, Adel

doi:10.1155/2016/4851454

Cited by 15 publications

(6 citation statements)

References 29 publications

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“…This can cause a change in the flow pattern, leading to loss of efficiency, in addition to the increase in vibration. It was observed that in the region of the blade suction, there is the presence of a high velocity gradient and these outcomes are also described in a similar case by [29], in his study on small Francis turbines with low flow rates. The visualization of this region is important due to the fact that these vortices creates low pressure regions, and the phenomenon of cavitation may occur.…”

Section: Performance Of the Indalma Hydro-turbinesupporting

confidence: 55%

Performance assessment of an Indalma hydro-turbine

et al. 2020

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Section: Performance Of the Indalma Hydro-turbinesupporting

confidence: 55%

Performance assessment of an Indalma hydro-turbine

et al. 2020

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“…It is found out that sliding mesh approach does not offer significant advantage when compared to the frozen rotor model based on comparisons with each other and experimental data. Laouari and Ghenaiet [18] used frozen rotor interface to simulate the turbulent flow through a small horizontal Francis turbine. Hydraulic performance is presented for different rotational speeds.…”

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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“…Una de las formas de analizar los daños superficiales que causa la cavitación es realizando la simulación numérica de un modelo utilizando un software de análisis de dinámica de fluido CFD (Computational Fluid Dynamics) para analizar los efectos de la variación de la velocidad del fluido, carga y presión sobre las partes del rodete. Para que el modelo sea considerado válido, los resultados numéricos deben ser comparados con mediciones experimentales [11], [12], [13].…”

Section: Análisis Numérico De Los Efectos De Launclassified

Plan de control y aseguramiento de la calidad para la recuperación de un rodete de turbina Francis de una central hidroeléctrica

Toapanta¹

2019

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El propósito del presente trabajo es establecer el procedimiento para el plan de inspección y ejecución de pruebas, para el control y el aseguramiento de la calidad, durante el proceso de recuperación de los rodetes de las turbinas Francis, que son elementos empleados como parte fundamental en las turbinas hidráulicas para la generación de energía eléctrica. El procedimiento de recuperación se basa en ejecutar el control dimensional sobre la geometría del rodete, la caracterización del material, el análisis metalográfico y los ensayos no destructivos END sobre los cordones de soldadura en base a las directrices de la especificación para máquinas hidráulicas CCH 70-4; para determinar las zonas de desgaste, afectadas por los fenómenos de cavitación, corrosión y erosión; así como las áreas dañadas por los mecanismos de falla como consecuencia de esfuerzos inherentes a factores de diseño, cargas y funcionamiento de las máquinas. Además, con esto se crea una referencia en cuanto a las capacidades técnicas y tecnológicas en el país, que se proyecta a nivel de la región para brindar servicios y soluciones de ingeniería especializados, logrando romper la dependencia de las grandes empresas extranjeras, creando un valor agregado con la transferencia del conocimiento; obteniendo de esta manera un ahorro sustancial en costos y tiempo en el proceso de recuperación de un rodete.

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Simulations of Steady Cavitating Flow in a Small Francis Turbine

Cited by 15 publications

References 29 publications

Performance assessment of an Indalma hydro-turbine

Performance assessment of an Indalma hydro-turbine

Rehabilitation of Francis Turbines of Power Plants with Computational Methods

Plan de control y aseguramiento de la calidad para la recuperación de un rodete de turbina Francis de una central hidroeléctrica

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