Determination and generalization of the effects of design parameters on Francis turbine runner performance

Ayli, Ece; Çelebioğlu, Kutay; Aradağ, Selin

doi:10.1080/19942060.2016.1213664

Cited by 14 publications

(11 citation statements)

References 12 publications

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“…Series: Hydraulic machines and hydraulic units, № 1ʹ2019 The obtained calculated data correspond to the previously known experimental recommendations on the positive effect of a small swirl flow at the entrance to the draft tube on the amount of losses in it [7,[18][19][20] and on the optimal, from the point of view of minimizing inductive losses, distribution pattern of the tangential velocity component an increase in its values in the peripheral region.…”

supporting

confidence: 78%

Research of Fluid Flow in Two-Dimensional and Three-Dimensional Formulation in the Flow Part of a High-Pressure Francis Turbine

Mironov¹,

Oleksenko²

2019

HM and HU

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The paper presents some results of a computational study of the spatial flow of a viscous fluid in a high-pressure Francis turbine Fr500 (in the optimal mode). To improve the energy performance at the preliminary design stage of the turbine, numerical flow simulations should be carried out. The difficulty of solving the problem posed is due both to the complex spatial geometry of the blade system of the runner and the varying degree of influence of the working bodies on the formation of energy characteristics. This CFD approach reduces costs and time in comparison with the experimental approach and makes it possible to improve and analyze turbine performance and its design before the model is manufactured. The computational complex of programs provides an opportunity to see the picture of pressure distribution, the field of velocity vectors and the movement of fluid particles for substantiation and analysis of results. Numerical modeling of the spatial flow in the flow part of the turbine was carried out to determine changes in the energy characteristics, therefore, the kε turbulence model was chosen, this model is the most successful model of first-level turbulence of the circuit. The results of the computational study confirm that the hydraulic efficiency of a hydraulic turbine largely depends on the losses in the guide vane and the runner, which means it is these elements that should be given the most attention, their design and coordination of the flow in them. Analysis of the energy loss in the flow part of the Francis turbine was carried out using programs for calculating fluid flow in twodimensional and three-dimensional formulation. The obtained calculated data correspond to the previously known experimental recommendations for high-pressure Francis turbine. The issues of increasing the energy performance of a projected high-pressure Francis turbine were considered.

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supporting

confidence: 78%

Research of Fluid Flow in Two-Dimensional and Three-Dimensional Formulation in the Flow Part of a High-Pressure Francis Turbine

Mironov¹,

Oleksenko²

2019

HM and HU

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“…7. Here, 1 β (for inlet) and 2 β (for outlet) are known as "Beta angles of the runner blade" or "the metal angles of the blade" [20]. In the same figure V 1u and V 2u are the circumferential velocities.…”

Section: Analysis Of the Existing Turbinementioning

confidence: 99%

“…To minimize this low-pressure zone, introducing a leaning from the shroud in the direction of rotation can be a solution [20]. Fig.…”

Section: Analysis Of the Existing Turbinementioning

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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“…The traditional one-factor-at-a-time approach has been widely used for evaluation or optimization of these parameters [16] [17] [18]. The major disadvantage of this approach is that it fails to consider any possible interaction between factors, and therefore it may lead to misinterpretation of results.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Impeller Geometry for an Automotive Torque Converter Using Response Surface Methodology and Desirability Function

Chen¹,

Chen²

2020

OJAppS

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Response surface methodology (RSM) based on desirability function approach (DFA) is applied to obtain an optimal design of the impeller geometry for an automotive torque converter. The relative importance of six design parameters including impeller blade number, blade thickness, bias angle, scroll angle, inlet angle and exit angle is investigated using orthogonal design approach. The impeller inlet angle, exit angle and bias angle are found to exert the greatest influence on the overall performance of a torque converter, with two flow area factors being considered, namely 17% and 20%. Then, RSM together with central composite design (CCD) method is used to in-depth evaluate the interaction effect of the three key parameters on converter performance. The results demonstrate that impeller exit angle has the strongest impact on peak efficiency, with larger angles yielding the most favorable results. The stall torque ratio maximization is attainable with the increase of impeller bias angle and inlet angle together with smaller exit angle. In the end, an optimized design for the impeller geometry is obtained with stall torque ratio and peak efficiency increased by 1.62% and 1.1%, respectively. The new optimization method can be used as a reference for performance enhancement in the design process of impeller geometry for an automotive torque converter.

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Determination and generalization of the effects of design parameters on Francis turbine runner performance

Cited by 14 publications

References 12 publications

Research of Fluid Flow in Two-Dimensional and Three-Dimensional Formulation in the Flow Part of a High-Pressure Francis Turbine

Research of Fluid Flow in Two-Dimensional and Three-Dimensional Formulation in the Flow Part of a High-Pressure Francis Turbine

Rehabilitation of Francis Turbines of Power Plants with Computational Methods

Optimization of the Impeller Geometry for an Automotive Torque Converter Using Response Surface Methodology and Desirability Function

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