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Megapie Project

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

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  1. Megapie Project CRS4 report CEA, Cadarache February, 26th 2002

  2. Pin-cooler simulation Spiral effect study on a simplified 3D simulation

  3. 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

  4. Flow characteristics • PbBi inlet: 4/12 l/s at 360 C • Diphyl THT oil: 10/12 l/s at 100 C

  5. Test cases

  6. Pin-cooler simulation Full 3D simulation with spiral separator in the rising oil channel.

  7. 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

  8. 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

  9. 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

  10. Main geometrical parameters

  11. Final mesh characteristics

  12. Run features • Parallel execution on 7 SP3 processors • Typical runtime: 12 hours • Steady state solutions • Variable turbulent Prandtl number • Modification of LBE wall functions

  13. Numerical and experimental results

  14. Oil flow orientation

  15. Wall function and Pr modifications effect • Modified wall functions increase heat exchange • Modified Prt decrease heat exchange

  16. 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.

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