核电厂自动卸压排放管道热分层分析研究

Thermal Stratification Analysis of NPP Automatic Depressurization Discharge Pipe

核电厂工艺系统的管道和设备中存在流动介质以不同温度分层的热分层现象,将会引起管壁温度分层,在管道截面产生总体弯曲热应力和局部热应力,并产生非预期的位移和支撑载荷。本文采用CFD方法分析了核电厂自动卸压排放管道的热分层现象,研究了管道内热分层形成机理及流动状态,得到了长期稳定运行工况下的热分层状态,为后续管道设计和布置提供参考。

There are the thermal stratification that occur in the system pipes and components of nuclear power plant,the fluid flow under different temperature layered,and results in the global bending moments,local thermal tresses, unexpected displacements and support loading of the pipe system.This paper were analyzed the thermal stralification of nuclear power plant automatic depressurization discharge pipe used Computational Fluid Dynamics （CFD） method,researched the formation mechanism of the thermal stratification and thermal-hydraulic flow in the pipe.obtained the thermal stratification condition on long-term stable operation mode,to provided the reference for the subsequent design and layout of this pipe.