Abstract:

Taken the steam generator of Daya Bay nuclear power plant as the prototype, two-way fluid solid interaction of steam generator heat transfer tube together with the primary and secondary side was numerically simulated. The results show that the two-way fluid solid interaction method adopted here can accurately capture the displacement variation of steam generator heat transfer tube. The biggest displacement of heat transfer tube is located at the center section. The tube deviates to the third quadrant at equilibrium state. Displacement in X direction is not equal to that in Y direction because of the fluid elastic instability. The stress intensity along the height of heat transfer tube is symmetrically distributed with respect to center section (0.5 m). Stress concentration occurs adjacent to the fixed support due to the effect of fixed constraint, so stress near the fixed support is biggest. The distribution regularities of stress intensity along the circumferential direction at different height are similar. Affected by the displacement of heat transfer tube, stress intensity is symmetrically distributed with respect to the line 20° and 200° connected. Stress extremum occurs adjacent to the angle of 20° and 200°. Two-way fluid solid interaction method of steam generator heat transfer tube can provide theoretical reference for the safety operation of steam generator.

Key words: steam generator, numerical simulation, fluid solid interaction, instability, stress intensity, safety