Fluid–structure interaction (FSI), the combination of computational fluid dynamics and computational solid mechanics, is considered as a procedure to determine the stress or strain of the solid under the influence of flow movement. Common parameters such as pressure and temperature that existed in the fluid solver and solid solver are the core factors of date communication in FSI. This work investigated the thermal stress and deformation distribution of the vapor segment of the water wall by numerical simulation under two typical conditions of the 660‐MW boiler. The ideal condition and the case with the oxide scale inside were compared to realize the peculiarity of parameter distribution. The results revealed that the peak temperature of water wall was 812.51 K and the maximum deformation was 19.286 mm under ideal condition. Thermal stress of the water wall in the central region was 70–90 Mpa under ideal condition. The “double‐wave peak” temperature tendency on the fire side was presented with both boundary conditions. However, in terms of the scaling condition, the temperature of water wall escalated result from the heat transfer deterioration. Besides, the scale layer hindered the free expansion of the pipe bank and restrained the deformation of the membrane water wall result in the increase of thermal stress and the decrease of reference deformation.

中文翻译：

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锅炉水冷壁流固耦合热应力分析

流固耦合（FSI）是计算流体动力学和计算固体力学的结合，被认为是确定在流动运动的影响下固体的应力或应变的过程。流体求解器和固体求解器中存在的常用参数（例如压力和温度）是FSI中日期通讯的核心因素。这项工作通过在660MW锅炉的两种典型条件下的数值模拟研究了水冷壁的蒸汽段的热应力和变形分布。比较了理想条件和内部氧化皮的情况，以实现参数分布的特殊性。结果表明，在理想条件下，水冷壁的峰值温度为812.51 K，最大变形为19.286 mm。在理想条件下，中心区域水冷壁的热应力为70–90 Mpa。在两个边界条件下都显示了火侧的“双波峰”温度趋势。然而，就结垢条件而言，水壁温度的升高是由于传热恶化而引起的。此外，水垢层阻碍了管束的自由膨胀并抑制了膜式水冷壁的变形，从而导致热应力的增加和参考变形的减小。