Francis Turbine Blade Design on the Basis of Port Area and Loss Analysis

Chen, Zhenmu; Singh, Patrick Mark; Choi, Young Do

doi:10.3390/en9030164

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…The CFD analysis process is directly connected to the optimum design process. The CFD analysis method was adopted from previous studies [33][34][35].…”

Section: Cfd Methodologymentioning

confidence: 99%

A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine

Shrestha

Choi

2020

Processes

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In recent times, optimization began to be popular in the turbomachinery field. The development of computational fluid dynamics (CFD) analysis and optimization technology provides the opportunity to maximize the performance of hydro turbines. The optimization techniques are focused mainly on the rotating components (runner and guide vane) of the hydro turbines. Meanwhile, fixed flow passages (stay vane, casing, and draft tube) are essential parts for the proper flow uniformity in the hydro turbines. The suppression of flow instabilities in the fixed flow passages is an inevitable process to ensure the power plant safety by the reduction of vortex-induced vibration and pressure pulsation in the hydro turbines. In this study, a CFD-based shape design optimization process is proposed with response surface methodology (RSM) to improve the flow uniformity in the fixed flow passages of a Francis hydro turbine model. The internal flow behaviors were compared between the initial and optimal shapes of the stay vane, casing, and the draft tube with J-Groove. The optimal shape design process for the fixed flow passages proved its remarkable effects on the improvement of flow uniformity in the Francis hydro turbine.

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“…The CFD analysis process is directly connected to the optimum design process. The CFD analysis method was adopted from previous studies [33][34][35].…”

Section: Cfd Methodologymentioning

confidence: 99%

A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine

Shrestha

Choi

2020

Processes

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“…According to the previous study, 20,21 a similar numerical simulation method for this Francis turbine model has been conducted. A commercial code ANSYS CFX was utilized for the numerical simulation.…”

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

Suppression of cavitation in the draft tube of Francis turbine model by J-Groove

Chen

Choi

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Cavitation is recognized as a phenomenon that can cause serious damage to a hydro turbine and can reduce its performance when operating at off-design point. This is an undesired phenomenon, which needs to be improved. In order to suppress the cavitation in the Francis turbine draft tube, a technology with grooved draft tube named J-Groove is introduced in the Francis turbine. The Francis turbine performance and the internal flow characteristic are investigated both with and without J-Groove installation by the experimental method and numerical simulation. Visualization was used to capture the cavitation rope in the Francis turbine draft tube to compare with the computational fluid dynamics analysis result. The results show that the turbine performance both with and without J-Groove installation is quite similar. Regardless of impact on performance of Francis turbine by J-Groove, it suppresses the cavitation vortex rope and pressure fluctuation in the Francis turbine draft tube efficiently.

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“…The performance characteristics based on the flow rates of air injection in the DT (see Figure 6) were investigated by considering the head losses of the runner and the DT of the Francis turbine model. The head losses of the runner and the DT were calculated from Equations ( 9) and (10), respectively [28]. The performance characteristics based on the flow rates of air injection in the DT (see Figure 6) were investigated by considering the head losses of the runner and the DT of the Francis turbine model.…”

Section: Internal Flow Characteristics Relative To the Air Injection ...mentioning

confidence: 99%

Section: Internal Flow Characteristics Relative To the Air Injection ...mentioning

confidence: 99%

Effect of Air Injection on the Internal Flow Characteristics in the Draft Tube of a Francis Turbine Model

2021

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Under low flow-rate conditions, a Francis turbine exhibits precession of a vortex rope with pressure fluctuations in the draft tube. These undesirable flow phenomena can lead to deterioration of the turbine performance as manifested by torque and power output fluctuations. In order to suppress the rope with precession and a swirl component in the tube, the use of anti-swirl fins was investigated in a previous study. However, vortex rope generation still occurred near the cone of the tube. In this study, unsteady-state Reynolds-averaged Navier–Stokes analyses were conducted with a scale-adaptive simulation shear stress transport turbulence model. This model was used to observe the effects of the injection in the draft tube on the unsteady internal flow and pressure phenomena considering both active and passive suppression methods. The air injection affected the generation and suppression of the vortex rope and swirl component depending on the flow rate of the air. In addition, an injection level of 0.5%Q led to a reduction in the maximum unsteady pressure characteristics.

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Francis Turbine Blade Design on the Basis of Port Area and Loss Analysis

Cited by 13 publications

References 7 publications

A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine

A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine

Suppression of cavitation in the draft tube of Francis turbine model by J-Groove

Effect of Air Injection on the Internal Flow Characteristics in the Draft Tube of a Francis Turbine Model

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