Prediction of dynamic blade loading of the Francis-99 turbine

CFD simulations focusing on capturing dynamic fluctuations of the flow for three operating points were performed for a scale model of a high head Francis turbine. A mesh sensitivity study showed an influence of the near wall resolution, consequently a low Reynolds mesh with a SST turbulence model wa...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2015-01, Vol.579 (1), p.12001-17
Main Authors: Nicolle, J, Cupillard, S
Format: Article
Language:English
Subjects:
Aerodynamics
Computer simulation
Draft tubes
Dynamics
Finite element method
Fluctuation
Fourier transforms
Mathematical models
Physics
Rotors
Scale models
Simulation
Stators
Turbines
Turbulence models
Velocity distribution
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:CFD simulations focusing on capturing dynamic fluctuations of the flow for three operating points were performed for a scale model of a high head Francis turbine. A mesh sensitivity study showed an influence of the near wall resolution, consequently a low Reynolds mesh with a SST turbulence model was used. Rotor/stator fluctuations are well reproduced with the full turbine simulation at all operating points. Velocity contours and average velocity profiles from LDV measurements in the draft tube confirm that the flow physics is generally well reproduced. Simplified approaches such as profile transform and Fourier transform underestimated the measured fluctuations. As full turbine simulations were time-consuming, a simulation with only the draft tube was performed at part load to predict the fluctuations in the draft tube cone. The SAS-SST turbulence model was able to capture the vortex rope behavior.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/579/1/012001