Failure investigation of a Pelton turbine runner

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dc.contributor	Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids
dc.contributor	Universitat Politècnica de Catalunya. FLUIDS - Enginyeria de Fluids
dc.contributor.author	Egusquiza Montagut, Mònica
dc.contributor.author	Egusquiza Estévez, Eduard
dc.contributor.author	Valentín Ruiz, David
dc.contributor.author	Valero Ferrando, Ma. del Carmen
dc.contributor.author	Presas Batlló, Alexandre
dc.date	2017-11
dc.identifier.citation	Egusquiza, M., Egusquiza, E., Valentin, D., Valero, M., Presas, A. Failure investigation of a Pelton turbine runner. "Engineering failure analysis", Novembre 2017, vol. 81, p. 234-244.
dc.identifier.citation	1350-6307
dc.identifier.citation	10.1016/j.engfailanal.2017.06.048
dc.identifier.uri	http://hdl.handle.net/2117/109565
dc.language.iso	eng
dc.publisher	Elsevier
dc.relation	http://www.sciencedirect.com/science/article/pii/S135063071630783X?via%3Dihub
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject	Àrees temàtiques de la UPC::Enginyeria mecànica
dc.subject	Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica::Vibracions mecàniques
dc.subject	Vibration
dc.subject	Finite element method
dc.subject	Mechanics
dc.subject	Vibració
dc.subject	Elements finits, Mètode dels
dc.subject	Mecànica
dc.title	Failure investigation of a Pelton turbine runner
dc.type	info:eu-repo/semantics/submittedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	In this paper, an uncommon failure of a Pelton turbine has been analyzed. After the monitoring system detected a sudden increase in the vibration levels, the turbine was inspected. The inspection showed that a fragment of one bucket broke off during operation. Moreover there were several buckets with cracks, always located in the same side of the buckets. An analysis of the detached fragment revealed a fatigue problem.After the damage was found, the vibration signatures measured by the monitoring system before damage, with damage and after repair, were analyzed. Before damage occurred, an excessive axial vibration and the excitation of several natural frequencies of the turbine were detected in the measured vibration.In order to identify the origin of the problem the first task was to analyze the dynamic response of the turbine. A numerical model of the runner using the finite element method (FEM) was done. Experimental research using modal analysis techniques (EMA) was also carried out in the turbine runner. The results of the numerical model were compared with the experimental results obtained. With the validated numerical model natural frequencies and mode-shapes were determined and studied.The next step was to determine experimentally the influence of the mounting conditions on the runner dynamics and the transmissibility of the runner vibrations to the machine bearings where the monitoring sensors are located.From the results of this study it was concluded that the natural frequencies excited during machine operation had axial mode shapes indicating that axial forces were applied to the runner. In a Pelton turbine, this can only be produced by a misaligned jet.To determine the influence of a misaligned jet on the bucket stresses, the dynamic behavior of the runner was performed. The dynamic force of the water jet was applied to the runner bucket. The results showed that with a misaligned jet the dynamic stress distribution increases in one side of the bucket with a maximum stress located where the cracks appeared.

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