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Open AccessArticle

Multiscale Simulation of the Hydroabrasive Erosion of a Pelton Bucket: Bridging Scales to Improve the Accuracy

1
Laboratory for Hydraulic Machines, École Polytechnique Fédérale de Lausanne (EPFL), Avenue de Cour 33 bis, 1007 Lausanne, Switzerland
2
Institute of Computational Science, Università della Svizzera Italiana (USI), Via Giuseppe Buffi 13, 6900 Lugano, Switzerland
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in the Proceedings of 13th European Conference on Turbomachinery Fluid Dynamics & Thermodynamics, ETC13, Lausanne, Switzerland, 8–12 April 2019; Paper No. 378.
Int. J. Turbomach. Propuls. Power 2019, 4(2), 9; https://doi.org/10.3390/ijtpp4020009
Received: 17 April 2019 / Revised: 8 May 2019 / Accepted: 10 May 2019 / Published: 21 May 2019
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Abstract

Erosive wear of hydraulic machines is a common issue, which results in efficiency degradation, the enhancement of cavitation, and the need for expensive maintenance. Although numerical simulations of the erosion process could be very useful, both for understanding and predicting the process, its multiscale nature renders it very difficult to simulate. A previously validated multiscale model of erosion is presented. It consists of two coupled sub-models: On the microscale, the sediment impacts are simulated by means of comprehensive physical models; on the macroscale, the turbulent sediment transport and erosion accumulation are calculated. A multiscale simulation of the erosion of a prototype-scale Pelton bucket impacted by a sediment-laden water jet is presented. The simulation results, namely the erodent flux and the distributions of average impact angle and velocity on the bucket surface, bring insight into the erosion process. Furthermore, the results explain the obtained erosion distribution, which is in very good agreement with the experimental erosion measurements available in the literature for the same test case. View Full-Text
Keywords: hydroabrasive erosion; erosive wear; multiscale model; numerical simulation; hydraulic turbine; Pelton turbine hydroabrasive erosion; erosive wear; multiscale model; numerical simulation; hydraulic turbine; Pelton turbine
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Leguizamón, S.; Jahanbakhsh, E.; Alimirzazadeh, S.; Maertens, A.; Avellan, F. Multiscale Simulation of the Hydroabrasive Erosion of a Pelton Bucket: Bridging Scales to Improve the Accuracy. Int. J. Turbomach. Propuls. Power 2019, 4, 9.

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