10 MWt 固态燃料熔盐堆的堆芯是由石墨球随机堆积而成的,在研究中对所有的石墨球进行网格划分和模拟计算存在较大困难.本文利用计算流体力学分析程序,基于多孔介质方法进行建模,分析堆内熔盐流动和换热的特性,同时研究入口温度、进口速度和孔隙率对熔盐流动和换热的影响,结果表明:在设计工况下堆芯进出口压降为3.5 kPa,温升为27 ℃,略小于设计值的28 ℃,熔盐密度从1987 kg/m3下降到1964 kg/m3.普朗特数(Pr)和进出口温升随着熔盐入口温度和进口速度的增加而减小,压降随着入口温度的减小和进口速度的增加而增大,孔隙率对Pr和进出口温升基本无影响,但对压降影响较大.%The core of 10-MWt molten salt reactor-solid fuel is constructed of the randomly packed graphite balls,it will bring difficulties and uncertainties in the establishment of the pebble bed model for simulation analysis. In this paper analysis of flow and heat transfer characteristics of molten salt using computational fluid dynamics(CFD)program and porous media method was carried out. Meanwhile the effects of inlet temperature,inlet velocity and porosity on the flow and heat transfer of molten salts were studied. The results showed that Δ P is 3.5 kPa,Δ T is 27 ℃ which is slightly smaller than the design value 28 ℃. The molten salt density decreased from 1987 kg/m3to 1964 kg/m3. Pr and Δ T will decrease with the increase of molten salt inlet temperature and inlet velocity,Δ P will increase with the inlet temperature decrease and inlet velocity increase. Porosity only has no influence on Pr and Δ T,but for Δ P the influence is much bigger.
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