Numerical analysis of fluid-added parameters for the torsional vibration of a Kaplan turbine model runner

The impact of fluid on the runner of a hydraulic turbine is a recurrent problem. Fully coupled fluid–structure simulations are extremely time-consuming. Thus, an alternative method is required to estimate this interaction to perform a reliable rotor dynamic analysis. In this article, numerical estim...

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Bibliographic Details
Published in:Advances in mechanical engineering Vol. 9; no. 10; p. 168781401773289
Main Authors: Soltani Dehkharqani, Arash, Cervantes, Michel J, Aidanpää, Jan-Olov
Format: Journal Article
Language:English
Published: London, England SAGE Publications 01.10.2017
Sage Publications Ltd
SAGE Publishing
Subjects:
Angular velocity
Computer Aided Design
Computer simulation
Damping
Datorstödd maskinkonstruktion
Efficiency
Engineers
Fluid Mechanics
Hydraulics
Inertia
Interaction parameters
Load
Mathematical models
Mechanical engineering
Numerical analysis
Parameter estimation
Simulation
Stiffness
Strömningslära
Studies
Torsional vibration
Turbines
Unsteady flow
Vibration analysis
Kaplan runner
added polar inertia
Fluid–structure interaction
added stiffness
added damping
ISSN:1687-8132, 1687-8140, 1687-8140
Online Access:Get full text
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Summary:The impact of fluid on the runner of a hydraulic turbine is a recurrent problem. Fully coupled fluid–structure simulations are extremely time-consuming. Thus, an alternative method is required to estimate this interaction to perform a reliable rotor dynamic analysis. In this article, numerical estimations of the added inertia, damping, and stiffness for a Kaplan turbine model runner are presented using transient flow simulations. A single-degree-of-freedom model was assumed for the fluid–runner interaction, and the parameters were estimated by applying a harmonic disturbance to the angular velocity of the runner. The results demonstrate that the added inertia and damping are important, whereas the stiffness is negligible. The dimensionless added polar inertia is 23%–27% of the reference value ( ρ R 5 ) . Damping significantly contributes to the moment at low excitation frequencies, whereas the inertia becomes dominant at higher frequencies.
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ISSN:1687-8132
1687-8140
1687-8140
DOI:10.1177/1687814017732893