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硝酸盐自然循环回路(Nitrate Natural Circulation Loop,NNCL)是先进熔盐堆非能动衰变热排出系统的实验回路,目的是获得自然循环下回路的传热、阻力等特性,验证计算分析方法的正确性等。本文采用RNG(Renormalization Group)k-ε湍流模型、增强壁面函数和SIMPLE(Semi-Implicit Method for Pressure Linked Equations)算法,对硝酸盐自然循环回路空冷塔部分的对流换热进行了数值模拟研究。计算结果表明:空冷换热器旁路漏流对换热有较大影响,可以通过旁路挡板增强换热能力,三层旁路挡板的设计能将换热能力提升近一倍。
The Nitrate Natural Circulation Loop (NNCL) is an experimental circuit of the passive molten salt reactor passive decay heat removal system. Its purpose is to obtain the heat transfer and resistance of the circuit under natural circulation and verify the correctness of the calculation and analysis methods Wait. In this paper, the numerical simulation of the convective heat transfer in the natural circulation circuit of nitrate natural circulation loop is carried out by the RNG (turbulence model), the enhanced wall function and the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm. The calculation results show that the bypass leakage of the air-cooled heat exchanger has a great influence on the heat transfer, and the heat exchange capacity can be enhanced by the bypass baffle. The design of the three-layer bypass baffle can nearly double the heat exchange capacity.