Hydro-abrasive erosion in Pelton turbine injectors: A numerical study

Messa, Gianandrea Vittorio; Mandelli, Simone; Malavasi, Stefano

doi:10.1016/j.renene.2018.06.064

Cited by 48 publications

(33 citation statements)

References 61 publications

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“…• It would be recommended to compare erosion from Finnie, Tilly, McLaury, Oka and DNV models to discuss about errors in erosion prediction by these models in case of Pelton turbine needle as these models are mostly recognized models for predicting erosion. Furthermore, the experimental comparison of Oka and DNV model will be validation of findings published in [41]. • Experimentally, coatings are found to improve the life of Pelton turbine needle.…”

Section: Discussionsupporting

confidence: 53%

“…Numerical modelling of the hydro abrasive erosion in Pelton turbine injectors through numerical simulations [41] is done using commercial CFD code STAR CCM+ neglecting occurrence of cavitation in flow domain. The erosion pattern as predicted by Oka erosion model in the numerical simulation seems to agree with the previously published literature.…”

Section: Flow and Erosion Areasmentioning

confidence: 99%

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Solid Particle Erosion Models and their Application to Predict Wear in Pelton Turbine Injector

Bajracharya

Shrestha

Timilsina

2020

J. Inst. Engineering

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Analysis of water quality of Himalayan originated rivers reveals the heavy sediment loading with a major portion of the sediment being hard mineral, quartz. Despite the incorporation of desanders to reduce the sediment content passing through hydro mechanical parts, significant wear is being reported in south-Asian hydroelectric projects. Repeated impact of such solid particles which are harder than the material of mechanical parts (mostly steel) is known to cause the erosion. Flow parameters, impact angle, mechanical properties of wall and particle, particle shape and size are commonly explored variables that affect the erosion of solid by the sediment-laden flow. In order to predict such erosion, starting with Finnie erosion model, several other erosion models considering aforementioned variables are proposed but are mostly case dependent. Application of numerical methods to understand flow problems constitutes the field of Computational Fluid Dynamics (CFD). Due to enclosed flow, reactions turbines took accelerated development in the investigations by CFD modeling. However, free surface jet and complex flow mechanism in buckets have been a major barrier to the application of CFD in case of Pelton turbines. Recent advancements in computational techniques, technological advancements have enabled to investigate flow in Pelton turbine by CFD. However, it is least understood which among the proposed erosion models will predict erosion occurring in Pelton turbine and assembly. This article explores about erosion in Pelton turbine, various erosion models and state of the art in modeling erosion of Pelton turbine injector. It is discussed which among the erosion models shall best predict the erosion occurring in the Pelton turbine injector. A short list of erosion models is then given which can be applied for the case of erosion in Pelton turbine injectors.

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Section: Discussionsupporting

confidence: 53%

Section: Flow and Erosion Areasmentioning

confidence: 99%

Solid Particle Erosion Models and their Application to Predict Wear in Pelton Turbine Injector

Bajracharya

Shrestha

Timilsina

2020

J. Inst. Engineering

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“…Other forces, such as lift force, Basset force, and gravity force, contribute little to the particle motion under certain circumstances [22,32], and are not considered in this study.…”

Section: Mathematical Model For Particlesmentioning

confidence: 99%

“…Zeng et al [31] simulated the needle erosion characteristics under the water-air two-phase flow. Similarly, Messa et al [32] conducted an erosion analysis of turbine injectors combined with the VOF (Volume of fraction) model and two different erosion models. It was reported that needle erosion strongly increases when the valve closes.…”

Section: Introductionmentioning

confidence: 99%

Slurry Flow and Erosion Prediction in a Centrifugal Pump after Long-Term Operation

et al. 2019

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After long-term operation, the material loss due to slurry erosion often leads to significant changes in the impeller geometry. This change can, in turn, affect the flow characteristics and the erosion mechanism in a centrifugal pump. To investigate this matter, we consider two geometric models based on a prototype stainless steel impeller, which failed due to huge erosion problems from the pulp slurry. These two models are different in the degree of wear, with one model at the pre-erosion stage and the other with worn blades. For both models, the flow characteristics have been obtained in the Eulerian reference frame by means of the SST k-ω model. Then, in order to determine the erosion patterns, the particles have been tracked in the Lagrangian reference frame. In this way, the influence of the flow characteristics on the erosion patterns has been analyzed. Results show that the geometric variations greatly affect the flow characteristics, and consequently the erosion patterns. Particularly, it has been found that the clearance flow plays a significant role in defining erosion characteristics, such as erosion distribution, areas, and rates. Interestingly, the simulation results for current study show that the erosion rates after long-term operation greatly decrease near both the outlet edge and the blade bottom. It follows also that for accurate erosion predictions, these geometric variations have to be considered in the numerical model. This paper provides a better understanding of the complex erosion mechanism in centrifugal pumps, which can help to reduce the wear in future designs.

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“…Noon et al [11] used the k-omega based Shear-Stress-Transport (SST) model and the Finnie and Tabakoff erosion models in ANSYS CFX to studied flow field and erosion wear on Francis Turbine components due to sediment flow, who found that erosion and efficiency loss both decreases with increase in particle shape factor. Messa et al [12] used a volume of fluid (VOF) model for simulating the free nozzle jet, a Lagrangian particle tracking model for the trajectories of the solid particles, and Oka and det norske veritas (DNV) models for estimating the mass removal. A previously validated multiscale model of erosion is presented by Leguizamón et al [13,14] to obtain erosion distribution and the erosion process of Pelton bucket impacted by a sediment-laden water jet.…”

Section: Introductionmentioning

confidence: 99%

Sediment Erosion Characteristics and Mechanism on Guide Vane End-Clearance of Hydro Turbine

Chen

Han

et al. 2019

Applied Sciences

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Sediment erosion caused by the collision of solid particles is a challenge for the safety, reliability, unit efficiency, and vibration noise of the hydroelectric engineering system located at China’s Yellow River and northwest inland basin. The sediment-laden flow of the guide vane end-clearance of the Francis Turbine at Dongshuixia hydroelectric station was used as the research object, and the large eccentric shaft structure of a guide vane was considered. Numerical calculations with the large eddy simulation (LES) and discrete phase models (DPMs) were carried out to study the erosion characteristics and mechanism of the end-surface of the guide vane and head cover, the flow mechanism of adverse erosion behind the shaft, and the influence law of the turbulence integral scale, turbulent kinetic energy, and turbulent flow angle on erosion. The flow field with a 1 mm clearance should set the number of particle trajectory per unit inlet area at about 1/mm2 to ensure the accuracy of calculation. The von Kármán vortex street is the main reason for adverse erosion behind the shaft and the low frequency energy of the turbulence plays a leading role in erosion. The above results provide a reference for the optimization design of an anti-wear guide vane and wear-protection of the clearance with sediment-laden water.

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Hydro-abrasive erosion in Pelton turbine injectors: A numerical study

Cited by 48 publications

References 61 publications

Solid Particle Erosion Models and their Application to Predict Wear in Pelton Turbine Injector

Solid Particle Erosion Models and their Application to Predict Wear in Pelton Turbine Injector

Slurry Flow and Erosion Prediction in a Centrifugal Pump after Long-Term Operation

Sediment Erosion Characteristics and Mechanism on Guide Vane End-Clearance of Hydro Turbine

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