Optimisation of Pelton turbine jet deflector using CFD analysis

Popovski, Boro; Lipej, Andrej; Markov, Zoran; Popovski, P.

doi:10.1088/1755-1315/240/2/022031

Cited by 10 publications

(7 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…de Siervo and Lugaresi (1978) [ 14 ] proposed similar equations: D c = 0.78 + 2.06 D r h n = 0.196 + 0.376 D r h = 0.47 + 0.2 D c = 0.63 + 0.41 D r …”

Section: Casing Design: Engineering Characteristics and Available Guidelinesmentioning

confidence: 99%

See 1 more Smart Citation

The state-of-art of design and research for Pelton turbine casing, weight estimation, counterpressure operation and scientific challenges

Quaranta¹,

Trivedi²

2021

Heliyon

View full text Add to dashboard Cite

The Pelton turbine is the most widespread and efficient impulse hydropower turbine. The Pelton casing is a static, but key component: the internal hydrodynamic phenomena affect the performance of the hydropower plant, the vibration of the equipment and water quality (dissolved oxygen downstream). However, the literature information is very fragmented and not well organized, so that the design is generally based on empirical rules and on proper know-how of hydropower companies. In this paper, the state-of-the-art of the Pelton casing is reviewed and organized under three macro areas: hydraulics, mechanics (vibrations and weight) and aeration. The preliminary design procedure is described and discussed in light of recent scientific results, and the open questions and research challenges are highlighted. Innovative case studies are described (including counterpressure operation) and a dataset of installed casings (not available in literature) is elaborated to derive an empirical equation to estimate the casing weight. The efficiency can be improved by 3% by an optimal fluid dynamic design and a better understanding of the internal hydrodynamics. Proper inserts can improve the hydraulic efficiency by 2%, reduce the weight (by about 12%) and better bear the vibrations. Several scientific questions are still open, and a better understanding of the fluid structure interaction is needed to improve efficiency, operation and water quality.

show abstract

“…de Siervo and Lugaresi (1978) [ 14 ] proposed similar equations: D c = 0.78 + 2.06 D r h n = 0.196 + 0.376 D r h = 0.47 + 0.2 D c = 0.63 + 0.41 D r …”

Section: Casing Design: Engineering Characteristics and Available Guidelinesmentioning

confidence: 99%

“…The turbine is enclosed inside a casing. A deflector is installed to stop the water jet in case of damages or emergency [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

The state-of-art of design and research for Pelton turbine casing, weight estimation, counterpressure operation and scientific challenges

Quaranta¹,

Trivedi²

2021

Heliyon

View full text Add to dashboard Cite

show abstract

“…The development of the jet deflector [11] was started with the initial geometry shown in Figure 7. This figure presents the shape of the jet for both calculations.…”

Section: Numerical Optimization Of Jet Deflectormentioning

confidence: 99%

Analysis of Free Surface Flow in Pelton Turbine Using Lattice Boltzmann Method

Lipej¹

2021

MESJ

Self Cite

View full text Add to dashboard Cite

Computational fluid dynamics (CFD) has become an indispensable tool in the development and optimization of various machines and devices in the last decade. In most cases, researchers deal with single-phase flows and internal flows where all externally wetted walls are defined. In some cases, it is also necessary to analyze multiphase flow and free-surface flow. Using classical numerical methods such as the finite element method (FEM) or the finite volume method (FVM), the results are highly dependent on the size and quality of the computational grids. Particular attention should be paid to the conditions at the boundary between the individual phases of the fluid. In most cases, it is necessary to consider non-stationary conditions and the necessity of using non-stationary numerical methods. All the above properties of multiphase flows and their consequences in performing numerical analyses lead us to very long computational times and consequently the use of very powerful computers. Industry often needs results in a relatively fast time therefore many simplifications need to be considered. Recently a new approach for numerical simulations of multiphase and free-surface flows based on the Lattice Boltzmann method (LBM) started to be used. The method is very useful especially for development of small-scale hydraulic turbines, where the expense for development process is usually very limited. In this paper, some examples of the use of LBM in the calculation of free-surface flows and compare the results using classical CFD methods have been presented.

show abstract

“…Various nozzle openings, jet contraction phenomena and jet velocity distributions were considered in the model. Popovski et al [8] provided a push-out jet deflector shape optimization method using CFD to reduce the stresses and torque on the deflector servomotor. Good correlation with experimental results was achieved, indicating that the method is reliable for design and development.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Analysis of Fluid Flow and Torque for Hydropower Pelton Turbine Performance Using Computational Fluid Dynamics

et al. 2022

View full text Add to dashboard Cite

The difficulty of delivering electrical power to rural areas motivated the researchers to explore more accessible power sources. Hydropower is considered a desirable option due to its sustainability and lower costs. Pelton turbines have been widely used in hydropower plants because of their low installation and maintenance costs. This study provides a computational fluid dynamics (CFD) model for Pelton turbine performance under various flow conditions. The model is based on the conservation of mass principle, Newton’s second law, and the first law of thermodynamics. It is used to predict the torque produced by a turbine at different rotational speeds. Previously published experimental results for the same turbine geometry and flow parameters were used to validate the model’s predictions. Validation revealed that the model can reproduce the experimental results. This provides the required robustness for its use as a tool for turbine design and modification.

show abstract

Optimisation of Pelton turbine jet deflector using CFD analysis

Cited by 10 publications

References 4 publications

The state-of-art of design and research for Pelton turbine casing, weight estimation, counterpressure operation and scientific challenges

The state-of-art of design and research for Pelton turbine casing, weight estimation, counterpressure operation and scientific challenges

Analysis of Free Surface Flow in Pelton Turbine Using Lattice Boltzmann Method

A Numerical Analysis of Fluid Flow and Torque for Hydropower Pelton Turbine Performance Using Computational Fluid Dynamics

Contact Info

Product

Resources

About