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Numerical estimation of torsional dynamic coefficients of a hydraulic turbine
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Chalmers University of Technology.
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 Rotating Machinery, ISSN 1023-621X, E-ISSN 1542-3034Article in journal (Refereed) Published
Abstract [en]

The rotordynamic behavior of a hydraulic turbine is influenced by fluid-rotor interactions at the turbine runner. In this paper computational fluid dynamics (CFDs) are used to numerically predict the torsional dynamic coefficients due to added polar inertia, damping, and stiffness of a Kaplan turbine runner. The simulations are carried out for three operating conditions, one at about 35% load, one at about 60% load (near best efficiency), and one at about 70% load. The runner rotational speed is perturbed with a sinusoidal function with different frequencies in order to estimate the coefficients of added polar inertia and damping. It is shown that the added coefficients are dependent of the load and the oscillation frequency of the runner. This affect the system's eigenfrequencies and damping. The eigenfrequency is reduced with up to 65% compared to the eigenfrequency of the mechanical system without the fluid interaction. The contribution to the damping ratio varies between 30-80% depending on the load. Hence, it is important to consider these added coefficients while carrying out dynamic analysis of the mechanical system.

Place, publisher, year, edition, pages
2009.
National Category
Other Mechanical Engineering Applied Mechanics
Research subject
Computer Aided Design; Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-15133DOI: 10.1155/2009/349397Local ID: e9c5bc70-8d6f-11de-8da0-000ea68e967bOAI: oai:DiVA.org:ltu-15133DiVA: diva2:988106
Note
Validerad; 2009; Bibliografisk uppgift: Paper id:: Article ID 349397; 20090820 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Karlsson, MartinAidanpää, Jan-Olov
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