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Evaluation of impact dynamics and contact forces in a hydropower rotor due to variations in damping and lateral fluid forces
Vattenfall Research & Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0001-6016-6342
2009 (English)In: International Journal of Mechanical Sciences, ISSN 0020-7403, E-ISSN 1879-2162, Vol. 51, no 9-10, p. 653-661Article in journal (Refereed) Published
Abstract [en]

Damages due to contact between the runner and the discharge ring have been observed in several hydroelectric power units. The damage can cause high repair costs of the runner and the discharge ring as well as considerable production losses.In this paper a rotor model of a 45 MW hydropower unit is used for the analysis of the rotor dynamical phenomena occurring due to contact between the runner and the discharge ring for different grade of lateral force on the turbine and bearing damping. The rotor model consists of a generator rotor and a turbine, which is connected to an elastic shaft supported by three isotropic bearings. The discrete representation of rotor model consist of 32 degrees of freedom, to increase the speed of the analysis the size of the model has been reduced with the IRS method to a system with 8 degrees of freedom.Results are presented in bifurcation diagrams, maximum contact force, Poincaré map and phase portrait. Simulations indicate that the contact forces between the turbine and the discharge ring are large, with considerable risks for serious damage as a consequence. The analysis shows that the risk for contact and damage are large for relatively small lateral turbine loads when the gap between the turbine and discharge ring is small and the contact stiffness is high.

Place, publisher, year, edition, pages
2009. Vol. 51, no 9-10, p. 653-661
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-8894DOI: 10.1016/j.ijmecsci.2009.07.002ISI: 000271137400003Scopus ID: 2-s2.0-70349451972Local ID: 77185db0-7d1e-11de-8da0-000ea68e967bOAI: oai:DiVA.org:ltu-8894DiVA, id: diva2:981832
Note
Validerad; 2009; 20090730 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Aidanpää, Jan-Olov

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