基于OpenFOAM的乏池内流动与换热计算

Calculation of Flow and Heat Transfer in Spent Pool Based on OpenFOAM

通过OpenFOAM对湿法贮存下的乏燃料池内的热工水力问题进行仿真分析,得到以下结论:在燃料组件区,由于多孔介质下的阻力,该部分流场流速较小。位于进水口正下方的套筒内的水流受到强迫对流的影响产生了自上而下的流动,远离入水管正下方的贮存格架内的水流受到自然对流的作用,均自下而上地流动。这种流动导致了经由注水直接冲刷的正下方的格架内的水温极低,邻近套筒内的局部高温;入水管正下方的格架内的温度分布受到水流方向的影响,呈现出底部温度高、顶部温度低的分布特征。由于位于出口下方的套筒与邻近套筒组成了回路,使得周围邻近套筒的水温出现极大值。

Through OpenFOAM, the thermal and hydraulic problems in the spent fuel pool under wet storage are simulated and analyzed, and the following conclusions are drawn: In the fuel assembly area, due to the resistance in the porous medium, the flow rate of the shunt field is small. The water flow in the sleeve directly below the inlet flows from top to bottom under the influence of forced convection, and the water flow in the storage lattice far away from the inlet pipe directly below the natural convection flows from bottom to top. This flow results in extremely low water temperature in the lattice directly below the flush by water injection and local high temperature in the adjacent sleeve;The temperature distribution in the grid directly below the inlet pipe is affected by the direction of water flow, showing the distribution characteristics of high temperature at the bottom and low temperature at the top. As the sleeve located below the outlet forms a loop with the adjacent sleeve, the water temperature of the surrounding adjacent sleeve is maximized.