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Dynamics of a misaligned Kaplan turbine with blade-to-stator contacts
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0003-0318-6157
Vattenfall Research & Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics.ORCID iD: 0000-0001-6016-6342
2015 (English)In: International Journal of Mechanical Sciences, ISSN 0020-7403, E-ISSN 1879-2162, Vol. 99, p. 251-261Article in journal (Refereed) Published
Abstract [en]

Rotor-to-stator contacts can occur in hydropower systems due to mechanical and electrical misalignment as well as high unbalance forces. It can result in high impact forces and damages in case of malfunction of the machine. As a result, a real hydropower rotor is studied to evaluate the different types of dynamic motion due to multiple impacts when it is initially misaligned. In this paper, the simplicity of its blade rubbing modelling allows us to evaluate in a fast and efficient way the dynamics of this system as a function of several design parameters. It is observed that the global dynamics of the system are similar to simple bladed Jeffcott rotors when scaled with the number of blades. Since the rotor runs at its operating point, the contact forces are also evaluated at nominal speed. A parametric study - as a function of contact stiffness and damping - is performed and results are given in terms of Poincaré sections, bifurcation diagrams and maximum displacements at steady state. These simulations are used to determine if the system is safe to operate. It can be used to design hydropower rotors by choosing the operating speed in a suitable range, or to analyse if the machine can be stopped before a catastrophe occurs

Place, publisher, year, edition, pages
2015. Vol. 99, p. 251-261
National Category
Other Mechanical Engineering
Research subject
Computer Aided Design
Identifiers
URN: urn:nbn:se:ltu:diva-4092DOI: 10.1016/j.ijmecsci.2015.05.023ISI: 000358625300024Scopus ID: 2-s2.0-84937545053Local ID: 1f5bf409-67db-4e13-9f9c-6cbf0b6d5cc7OAI: oai:DiVA.org:ltu-4092DiVA, id: diva2:976954
Note
Validerad; 2015; Nivå 2; 20150615 (flothi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Thiery, FlorianAidanpää, Jan-Olov

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