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固态燃料熔盐堆(Thorium Molten Salt Reactor-Solid Fuel,TMSR-SF)的堆芯是由燃料石墨球随机堆积而成的,在分析中建立随机堆积的小球模型存在较大困难和不确定性,通常假设为规则的排布方式。利用计算流体力学分析程序,选取了面心立方和体心立方两种规则的小球排布方式进行建模,分析不同排布方式下堆芯流动和换热的特性。结果表明,面心立方排布下的流线呈现出周期性弯曲,小球中心最高温度为1 153 K,总压降为1 323 Pa,体心立方排布下的流线大体呈直线,小球中心最高温度为1 155 K,总压降为574 Pa,面心立方排布的流动压降明显大于体心立方排布。对于单个中间小球,面心立方排布的小球表面温度分布更均匀,热点温度更低,但熔盐从燃料球底部流动到顶部的压降更大。
The core of Thorium Molten Salt Reactor-Solid Fuel (TMSR-SF) is a random accumulation of fuel graphite spheres, and there are great difficulties and uncertainties in the analysis of establishing random accumulation spheres model , Usually assumed to be the arrangement of rules. The computational fluid dynamics analysis program was used to select the two kinds of rules of face-centered cubes and body-centered cubes to model the arrangement of pellets. The characteristics of core flow and heat transfer under different arrangements were analyzed. The results show that the flow lines under the face-centered cubic arrangement show periodic bending. The maximum temperature of the pellet center is 1 153 K and the total pressure drop is 1 323 Pa. The flow line under the cubic arrangement of the body-centered curve is generally linear. The maximum temperature is 1 155 K and the total pressure drop is 574 Pa. The pressure drop in the face-centered cubic arrangement is obviously larger than the body-centered cubic arrangement. For a single intermediate pellet, the face-centered cube has a more uniform surface temperature distribution and a lower hot spot temperature, but the pressure drop of molten salt from the bottom of the fuel pellet to the top is greater.