heat transfer studies in electric generators for hydropower ...hani/ofgbg17/presentation...
TRANSCRIPT
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Bercelay Niebles Atencio
Department of Mechanics and Maritime Sciences
CHALMERS UNIVERSITY OF TECHNOLOGY
Gothenburg, Sweden, 2017
Heat transfer studies in electric generators for
hydropower using OpenFOAM
(Foam-extend 4.0)
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Current status
- Design phase of electric generatos relies on empirical correlations (network models).
- Large uncertainties.
- Flow of cooling air have been studied in the past.
- Many studies focused on flow, thermal models, few experiments.
- To the best of knowledge, nothing done in openFOAM regarding heat transfer in
hydrogenerators.
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Electric Generators for Hydropower
Sketch of an electric generator for hydropower.
Source: http://www.eternoohydro.com/hydro-generator/
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Solvers in openFOAM
We want them to be merged!
- Conjugate heat transfer processes:
chtMultiRegionSimpleFoam
- Rotation of fluid:
MRFSimpleFoam
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chtMRFSimpleFoam
Having chtMultiRegionSimpleFoam as the base solver
In the .C file
In the createFluidFields file
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In the Ueqn.
In the pEqn.
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Testing chtMRFSimpleFoam
Heat
Solid region
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chtSourceMRFSimpleFoam
Having chtMRFSimpleFoam as the base solver
In the solveSolids.H file
In the createSolidFields file
In the setSolidFields file
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Heat generation
Solid region
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Network Models
-One slot
-Heat generation (coil, core)
-No rotation
-Periodicity and symmetry
-kOmegaSST
Inner
Outer
Stator Core
Rotor
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CFD for Network Model Case
ReNusselt Number
CFD Gnielinksi Dittus-Boelter
3152 15.7 7.9 12
3520 16.8 9.1 13
3960 17.5 10.4 14.3
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Hydro-generator model experimental rig
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Heat transfer simulations
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Simulations for the hydro-generator model
-Inlet, rotor, stator cellZones
-kOmegaSST – low Re
-MRFSimpleFoam + heat
-Periodic
-Mixing Plane
-Flow field
-Heat transfer in stator channels
Inlet
Rotor
Stator
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Simulations
Preliminary U field @ 10000 iterations (still running)
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Experiments
- Oil visualizations
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Experiments
- Naphthalene Sublimation
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Thank you!