Two-way fluid solid interaction numerical analysis of steam generator heat transfer tube

doi:10.11949/j.issn.0438-1157.20160466

Abstract

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

摘要：

以大亚湾核电站蒸汽发生器为原型，考虑一、二次侧流体的共同作用，进行蒸汽发生器传热管双向流固耦合数值模拟。计算结果表明：所采用的双向流固耦合方法能较好地捕捉到蒸汽发生器传热管的位移变化规律，传热管中心截面的位移最大，且平衡时向第3象限偏移，由于流体弹性不稳定性的影响，X、Y方向的位移大小并不相等。沿传热管高度方向应力关于中心截面（0.5 m）对称分布，固定端附近由于固定约束的作用产生应力集中应力最大。不同截面上应力沿圆周方向的分布规律相似，受传热管位移的影响关于20°和200°所连的直线对称分布，在20°和200°附近出现应力极值。蒸汽发生器传热管双向流固耦合方法可为蒸汽发生器安全运行提供理论参考。

关键词: 蒸汽发生器, 数值模拟, 流固耦合, 不稳定性, 应力, 安全

CLC Number:

TL331

ZHAO Yingjie, SUN Baozhi, SHI Jianxin, GAN Yiran, LIU Shanghua. Two-way fluid solid interaction numerical analysis of steam generator heat transfer tube[J]. CIESC Journal, 2016, 67(S1): 217-223.

赵颍杰, 孙宝芝, 史建新, 干依燃, 刘尚华. 蒸汽发生器传热管双向流固耦合数值分析[J]. 化工学报, 2016, 67(S1): 217-223.

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