Numerical simulation of six jet Pelton turbine model

Gupta, Vishal; Prasad, Vishnu; Khare, Ruchi

doi:10.1016/j.energy.2016.03.110

Cited by 42 publications

(22 citation statements)

References 6 publications

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“…When evaluated from efficiency, mechanical efficiency of this turbine is above 80%, precisely at 83%. When compared with previous studies, this turbine has the same efficiency as the researchers conducted by Gupta et al (2016) [16], Vesely and Varner (2001) [20] and Perrig (2007) [21].…”

Section: B Discussionsupporting

confidence: 53%

“…The air value is 0.072 N/m, the turbulence intensity value is 5%, the pressure at the opening is assumed to be atmospheric pressure, the ambient temperature is 25 0 C, gravity at Y axis is 9.81 m/s 2, and rotational speed is 30,8 rad/s clockwise. The turbulence model used is SST k-ω [16]. It is used because it can represent the actual flow condition near the wall and away from the wall.…”

Section: B Methodsmentioning

confidence: 99%

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Cutout Types Analysis on Picohydro Pelton Turbine

Budiarso¹,

Warjito²,

Adanta³

et al. 2018

Int. J. Adv. Sci. Eng. Inf. Technol.

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Pico hydro is a simple electricity generation technology and can be applied in remote areas that do not have access to electricity. Pico hydro systems produce power less than or equal to 5 kW. Pelton turbine is an impulse turbine frequently used in a pico hydro system. Pelton turbine has a cut-out in its buckets that prevent the water jet leak from the tip of the bucket into the next bucket. The study has been done to explain the effects of bucket geometry on energy conversion from water flow into kinetic energy. Four different types of cutouts namely ω, v, w and u were used. This study aims to find the best cutout geometry, which can convert the most water energy. The computation method is utilized to study in detail the flow of the fluid. In this study, there is two principal analysis performed, first is ANOVA blocking design for torque analysis, and the second is a qualitative analysis of the flow passing the cutout. The results indicate that the cutouts of the buckets have a significant influence on generated torque. The analysis revealed that u type cut-out buckets give the best performance among others type of buckets and are the easiest to manufacture.

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Section: B Discussionsupporting

confidence: 53%

Section: B Methodsmentioning

confidence: 99%

Cutout Types Analysis on Picohydro Pelton Turbine

Budiarso¹,

Warjito²,

Adanta³

et al. 2018

Int. J. Adv. Sci. Eng. Inf. Technol.

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show abstract

“…Because of the complexity of the analysis, a preliminary in-depth study was carried out to evaluate the influence of the main numerical parameters on the stability of the simulation, in line with [6]. Based on previous studies in the literature [7] several simplifications can be made to the geometry that will have minimal effect on the predicted flow but which significantly reduce the model size:…”

Section: Model Definitionmentioning

confidence: 99%

Estimating the Energy Loss in Pelton Turbine Casings by Transient CFD and Experimental Analysis

Petley¹,

Aggidis²

2019

IJFMS

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Many consider the Pelton turbine a mature technology, nevertheless the advent of Computational Fluid Dynamics (CFD) in recent decades has been a key driver in the continued design development. Impulse turbine casings play a very important role and experience dictates that the efficiency of a Pelton turbine is closely dependent on the success of keeping vagrant spray water away from the turbine runner and the water jet. Despite this overarching purpose, there is no standard design guidelines and casing styles vary from manufacturer to manufacturer, often incorporating a considerable number of shrouds and baffles to direct the flow of water into the tailrace with minimal interference with the aforementioned. The present work incorporates the Reynolds-averaged Navier Stokes (RANS) k-ɛ turbulence model and a two-phase Volume of Fluid (VOF) model, using the ANSYS® FLUENT® code to simulate the casing flow in a 2-jet horizontal axis Pelton turbine. The results of the simulation of two casing configurations are compared against flow visualisations and measurements obtained from a model established at the National Technical University of Athens. Further investigations were carried out in order to compare the absolute difference between the numerical runner efficiency and the experimental efficiency. In doing so, the various losses that occur during operation of the turbine can be appraised and a prediction of casing losses can be made. Firstly, the mechanical losses of the test rig are estimated to determine the experimental hydraulic efficiency. Following this, the numerical efficiency of the runner can then be ascertained by considering the upstream pipework losses and the aforementioned runner simulations, which are combined with previously published results of the 3D velocity profiles obtained from simulating the injectors. The results indicate that out of all of the experimental cases tested, in the best case scenario the casing losses can be approximated to be negligible and in the worst case scenario ≈3%.

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“…ese studies are mainly focused on the performance calculation [1,2]; the bucket erosion [3][4][5][6]; and the bucket fracture [7][8][9]. Computer fluid dynamics (CFD) simulations and most experimental studies are carried out considering that jet centerline coincides with bucket centerline.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Model for Axial Motion of Horizontal Pelton Turbine and Validation in Actual Failure Case

Rodríguez

Zambrano

Reyes

et al. 2020

Shock and Vibration

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Pelton turbines are important machines for power generation from a renewable energy source such as water. For power rates below 20 MW, the rotor of Pelton turbines is usually in horizontal position. Considering ideal mounting and operating conditions, there are no axial forces acting on the rotor. In practice, there is an hydraulic force due to the difference between nozzle centerline and bucket centerline, and there is a magnetic force due to the difference between axial position of stator and rotor magnetic field centers. These forces are supported by bearings. In this article, a nonlinear dynamic model considering these axial forces and bearings behavior is presented and solved for two different actual Pelton turbines. The nonlinear dynamic model allows determining and evaluating the source of axial motion and therefore provides valuable information in order to reduce it when the axial displacement is high enough to produce damage.

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Numerical simulation of six jet Pelton turbine model

Cited by 42 publications

References 6 publications

Cutout Types Analysis on Picohydro Pelton Turbine

Cutout Types Analysis on Picohydro Pelton Turbine

Estimating the Energy Loss in Pelton Turbine Casings by Transient CFD and Experimental Analysis

Dynamic Model for Axial Motion of Horizontal Pelton Turbine and Validation in Actual Failure Case

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