蒸汽发生器二次侧传热管流体动力学与冲蚀的协同效应

Synergistic effect of hydrodynamics and erosion on secondary side heat transfer tube of a steam generator

为了揭示了流体流动效应对SG传热管的冲蚀机理,本文通过对带有梅花形支撑板的蒸汽发生器传热管进行数值模拟。利用COMSOL Multiphysics软件中的CFD和DNV冲蚀模型对带有梅花形支撑板的SG二次侧传热管水动力效应对传热管的冲蚀影响数值模拟,分析了流体及携带的固体颗粒流经带有梅花形支撑板时对传热管的影响。结果显示:流体流经支撑板后形成漩涡,并且由漩涡引导流体流向管壁运动,造成传热管壁面应力值急剧上升,并有冲蚀发生,导致传热管的局部损伤;流体流经支撑板后固体颗粒对管壁造成的冲蚀与流体动力学具有协同效应。

To reveal the erosion mechanism of the fluid flow effect on the steam generator(SG)heat transfer tube,the numerical simulation of the SG heat transfer tube with the plum blossom-shaped support plate is carried out in this paper.Using the CFD and DNV erosion models in the COMSOL Multiphysics software,the hydrodynamic effect of the secondary side heat transfer tube of SG with the quincunx-shaped support plate is used to numerically simulate the erosion effect of the heat transfer tube and the effect of fluid and the entrained solid particles on the heat transfer tube when flowing through a support plate with a quincunx shape.Results show that the vortex is formed after the fluid flows through the support plate,and the vortex guides the fluid to move to the tube wall,thereby significantly intensifying the wall stress and erosion of the heat transfer tubes as well as the local damage of the heat transfer tubes.The erosion caused by solid particles on the pipe wall after the fluid flows through the support plate has a synergistic effect with hydrodynamics.