Numerical Estimation of Torsional Dynamic Coefficients of a Hydraulic Turbine
Joint Authors
Nilsson, Håkan
Karlsson, Martin
Aidanpää, Jan-Olov
Source
International Journal of Rotating Machinery
Issue
Vol. 2009, Issue 2009 (31 Dec. 2009), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2009-06-22
Country of Publication
Egypt
No. of Pages
7
Main Subjects
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.
American Psychological Association (APA)
Karlsson, Martin& Nilsson, Håkan& Aidanpää, Jan-Olov. 2009. Numerical Estimation of Torsional Dynamic Coefficients of a Hydraulic Turbine. International Journal of Rotating Machinery،Vol. 2009, no. 2009, pp.1-7.
https://search.emarefa.net/detail/BIM-464833
Modern Language Association (MLA)
Karlsson, Martin…[et al.]. Numerical Estimation of Torsional Dynamic Coefficients of a Hydraulic Turbine. International Journal of Rotating Machinery No. 2009 (2009), pp.1-7.
https://search.emarefa.net/detail/BIM-464833
American Medical Association (AMA)
Karlsson, Martin& Nilsson, Håkan& Aidanpää, Jan-Olov. Numerical Estimation of Torsional Dynamic Coefficients of a Hydraulic Turbine. International Journal of Rotating Machinery. 2009. Vol. 2009, no. 2009, pp.1-7.
https://search.emarefa.net/detail/BIM-464833
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-464833