1 parametric thermal-hydraulic analysis of tbm primary helium loop greg sviatoslavsky fusion...
TRANSCRIPT
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Parametric Thermal-Hydraulic Analysis of TBM Primary Helium Loop
Greg SviatoslavskyFusion Technology Institute,
University of Wisconsin, Madison, WI
With contributions from
C.P.C. Wong, General Atomics, M. Dagher, S. Smolentsev, UCLA, S. Malang, Consultant, Germany
ITER US TBM MeetingUCLA
MAY 10, 2006
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Presentation Outline
Primary helium loop description
First Wall thermal analysis
TBM pressure drop
Results summary
Future work & consideration
3
He Circuit 1
He Circuit 2
Primary Helium Loop
Back PlateFirst Wall
Top Plate
Bottom Plate
Divider Plate
Grid Plates
4
First Wall Analysis ApproachD-T Transient
Thermal Conditions
Helium Inlet & Outlet
Temperature
Parametric Analysis
FW Channel Layout
FW Temperature
LimitsRequire Heat
Transfer Coefficient (h)
Require Helium Flow
Rate
Channel Dimensions & Roughening
Max FW Temperature
FW Pressure
Drop
Parametric Analysis
Parametric Analysis
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• 0.3 MW/m2 flux over 90% & 0.5 MW flux over 10% FW
• Nuclear heating based on scaling prior neutronic results
• 520o C maximum FW temperature at 2 mm depth
• 550o C maximum FW surface temperature
First Wall Analysis Input Parameters
• 300o C helium TBM inlet temperature
• 390o C helium TBM outlet temperature
• 20 mm x 19.6 mm channel cross-section dimensions
• Uniform sand-grain roughness
• Seven pass circuit layout (5 channels per pass)
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• 0.89 kg/s required helium flow rate
• 4813 W/m2-K heat transfer coefficient
• 378o C FW helium exit temperature
• 523o C maximum FW temperature at 2 mm depth
• 556o C maximum FW surface temperature
First Wall Thermal Analysis Results
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Circuit 2 Total P-drop 0.0107
MPa
TBM Pressure Drop ResultsFirst Wall 0.096 MPa
Top Plate 0.001 MPa
Bottom Plate 0.001 MPa
Divider Plate
Grid Plates
First Wall 0.096 MPa
0.003 MPa
0.01 MPa
0.005 MPa
Circuit 1 Total P-drop 0.104
MPa
8 0.000
0.020
0.040
0.060
0.080
0.100
0.120
Pre
ssu
re D
rop
(M
Pa)
• First Wall 0.096 MPa
• Top/Bottom Plate 0.001 MPa
• Divider Plate 0.005 MPa
• Upper Grid Plates 0.003 MPa
• Lower Grid Plates 0.01 MPa
TBM Pressure Drop Results
Fir
st W
all
Top
Pla
te
Bot
tom
Pla
te
Div
ider
Pla
te
Upp
er G
rid
Pla
te
Low
er G
rid
Pla
te
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• Downstream (hotter) FW flow requires higher h than upstream (cooler) flow
• Control velocity with number of channels per pass [h is f(velocity)]
• Initial analysis indicates pressure drop improves by 34%
Alternate FW Channel Configuration
Pass 1 Pass 2 Pass 3
Fixed Flow Rate
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Helium Thermal-Hydraulic Results SummaryOperational Phase D-T Operation
Heat Flux (transient)0.3 MW over 90% &
0.5 MW over 10%
FW Configuration 7 pass, 5 channels/pass
Flow Rate - FW Velocity 0.89 kg/s - 37 m/s
TBM He inlet/outlet Temperature 300oC / 390oC
Wall Roughness Uniform sand-grain (FW)
Pressure Drop 0.107 MPa
Max FW temperature556oC (surface)
526oC (@ 2mm)
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Future Work & ConsiderationFuture Work & Consideration
Evaluate back plate design
Can we do without 2D roughening?
Determine maximum allowable pressure drop
Investigate alternate configurations
CFD analysis required to better account for FW counter flow and TBM flow distribution
Continue iteration with MHD analysis
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Back-up Slides
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Nuclear Heating Values
First Wall 82187 W
Top Plate 5253 W
Bottom Plate 5253 W
Divider Plate 12200 W
Grid Plates 17113 W
Side Walls 35938 W
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Helium Properties
Density 6.1 kg/m^3
Specific Heat 5200 j/kg-K
Thermal Conductivity 0.253 W/m-k
Viscosity 3.50E-05 kg/m-s