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Megapie Project. CRS4 report CEA, Cadarache February, 26 th 2002. Pin-cooler simulation. Spiral effect study on a simplified 3D simulation. Geometrical characteristics. Pass (h) 85 mm Height (H) 510 mm Spiral diameter (Sd) 1.5 mm Oil annulus internal diameter D 47 mm

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Megapie project

Megapie Project

CRS4 report

CEA, Cadarache

February, 26th 2002


Pin cooler simulation

Pin-cooler simulation

Spiral effect study on a simplified 3D simulation


Geometrical characteristics
Geometrical characteristics

  • Pass (h) 85 mm

  • Height (H) 510 mm

  • Spiral diameter (Sd) 1.5 mm

  • Oil annulus internal diameter D 47 mm

  • Oil annulus width (dr1) 2.1 mm

  • Steel wall width (dr2) 1.5 mm

  • PbBi annulus width (dr3) 4.25 mm

  • Spiral angle over horizontal plane () 30o


Flow characteristics
Flow characteristics

  • PbBi inlet: 4/12 l/s at 360 C

  • Diphyl THT oil: 10/12 l/s at 100 C



Pin cooler simulation1

Pin-cooler simulation

Full 3D simulation with spiral separator in the rising oil channel.


Flow characteristics1
Flow characteristics

  • PbBi inlet: 4 l/s at 360 C

  • Diphyl THT oil: 10 l/s at 100 C

  • Power exchanged: 64 kW

  • PbBi: DP=108 kPa for Dz=1.382 m

  • Diphil THT Oil (rising column): 170 kPa for Dz=1.402 m


Simulation features
Simulation features

  • About 2 millions cells, 1.3 million for Oil

  • Spiral: 15 loops with 85 mm gap

  • Non matching regions inside oil region and in solid.

  • Chen variant of k-e model

  • Wall functions for PbBi

  • Two layers for Oil


Ultimate changes
Ultimate changes

  • Spiral diameter from 1.5 to 1.6mm

  • Spiral orientation (indirect triad)

  • Spiral in-lining

  • Partial account for the 1mm diameter thermo-couple wires

  • Thermo-couples positioning

  • Separation of upper LBE region

  • Main non-matching transition from steel to LBE




Run features
Run features

  • Parallel execution on 7 SP3 processors

  • Typical runtime: 12 hours

  • Steady state solutions

  • Variable turbulent Prandtl number

  • Modification of LBE wall functions




Wall function and pr modifications effect
Wall function and Pr modifications effect

  • Modified wall functions increase heat exchange

  • Modified Prt decrease heat exchange


Conclusions
Conclusions

  • Numerical simulation led to individuate a problem in proximity of the LBE inlet gap.

  • Total heat exchange is controlled by the global mass flow rates independently of small geometrical perturbations and is extremely well reproduced.

  • The spiral wire seems to introduce a strong sensibility of the Oil pressure losses to small geometrical perturbations.