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基于计算流体力学(Computational Fluid Dynamics,CFD)通用计算程序Fluent,研究了模块化熔盐冷却球床堆(Pebble Bed Advanced High Temperature Reactor,PB-AHTR)中心热通道稳态热工水力行为。利用已开发的多孔介质流固两相局域非热平衡模型计算了球床堆中的压降、冷却剂的温场分布以及固相球床的温场分布,计算并比较了不同的多孔介质阻力因子(Ergun与KTA)对通道内的冷却剂流动以及温场分布的影响,并对丧失部分冷却剂情况下通道内的冷却剂及燃料温度进行了计算分析。结果表明使用不同的阻力因子对堆芯压降计算结果和流场的分布影响较大;而冷却剂温场及固相球床温场和球心的温度分布在不同的阻力因子下的差别较小,在PB-AHTR的设计参数下堆芯产生的热量能够被有效的输出,设计具有较大的安全裕度。计算结果对于球床堆的优化设计提供了一定的参考价值。
Based on Fluent, a general computational fluid dynamics (CFD) computational program, the steady-state thermal-hydraulic behavior of the hot aisle in the center of the Pebble Bed Advanced High Temperature Reactor (PB-AHTR) was studied. The pressure drop in the bed, the temperature distribution of the coolant and the distribution of the temperature field in the solid spherical bed were calculated by using the developed non-thermal equilibrium model of the solid-liquid two-phase porous media. The different porous media resistance (Ergun and KTA) on the coolant flow and temperature field distribution in the passage, and calculated the coolant and fuel temperature in the passage with some coolant loss. The results show that the different resistance factors have great influence on the calculation results of core pressure drop and the distribution of flow field. However, the differences of temperature field in the coolant temperature field and the temperature distribution of the bed temperature field and the sphere center are different under different resistance factors Small, the core of the PB-AHTR design parameters of the heat generated can be effectively output, the design has a greater safety margin. The calculation results provide some reference value for the optimization design of the bed bed.