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采用三维全尺寸非稳态流固耦合传热的计算流体动力学(computational fluid dynamics,CFD)方法对压水堆稳压器波动管发生热分层现象时的流动与传热进行数值研究。与以往的模型相比,将计算控制区域扩展到波动管管壁所在的固体区域,采用更适合于求解具有二次回流和流动分离情况的剪切应力输运(shear stress transport,SST)K-ω湍流模型。在评价浮升力对管内流动与换热影响时,利用较Boussinesq近似更有效的计算方法。从而,得到更加精确的管道瞬态壁温分布及变化规律并对所得结论进行了详尽分析,为准确评价热分层现象对波动管使用寿命损耗的影响提供可靠依据。
The computational fluid dynamics (CFD) method of three dimensional full scale unsteady fluid-solid coupling heat transfer was used to numerically study the flow and heat transfer in the thermal stratification of PWR surge tube. Compared with the previous model, the calculation control region is extended to the solid region where the wall of the fluctuating tube is located, and the shear stress transport (SST) K- ω turbulence model. In evaluating the effect of buoyancy on the flow and heat transfer in the tube, a more efficient method than the Boussinesq approximation is used. Therefore, the more accurate pipe transient wall temperature distribution and variation rules are obtained and the conclusions are analyzed in detail. This provides a reliable basis for accurately evaluating the effect of thermal stratification on the service life loss of corrugated pipe.