Effect of Pebble Size Distribution and Wall Effect on Inner Packing Structure and Contact Force Distribution in Tritium Breeder Pebble Bed

In the tritium breeding blanket of nuclear fusion reactors, heat transfer behavior and thermal-mechanical response breeder pebble bed are affected by inner packing structure, which is crucial for design optimization a reliable in blanket. Thus, effect size distribution fixed wall on structure contact force poly-disperse were investigated numerical simulation. The results show that has significant influence bed. With increase dispersion size, average porosity coordination number gradually decrease. Due to wall, shows an obvious effect. For bed, influenced region decreases with size. addition, gravity have inside majority weak less than force. Only few pebbles strong greater This investigation can help analyzing crushing characteristics thermal hydraulic analysis