示范快堆堆坑通风冷却三维数值模拟

为详细研究示范快堆堆坑内空气流动状态和温度分布情况，检验现行堆坑通风系统布置合理性与冷却效果，本文利用CFD软件对正常运行工况下的示范快堆堆坑空气流域进行三维数值模拟。结果表明，通风系统冷却效果满足设计要求，堆坑混凝土内壁最高温度为50.7 ℃，但堆坑内部流场复杂，温度分布的不均匀性较高，通风系统进出口排布方式需进一步优化。计算结果为主容器及贯穿件支承热工计算提供了更为准确的边界条件，为示范快堆一回路设计提供参考。

Three-dimensional Numerical Simulation of Ventilation Cooling for Demonstration Fast Reactor Pit

In order to study in detail the air flow characteristics and temperature distribution in the demonstration fast reactor pit, and verify the rationality and cooling effect of the current pit ventilation system, the three-dimensional numerical simulation of the air flow basin of the demonstration fast reactor pit under normal operating conditions was carried out by using CFD software. The results show that the cooling effect of the ventilation system meets the design requirements, and the maximum temperature of the inner wall of the concrete is 50.7 ℃. However, the internal flow field of the pit is complicated and the temperature distribution is uneven, and the ventilation system import and export layout needs to be further optimized. The calculation results provide more accurate boundary conditions for the thermal calculation of the main vessel and the penetration support, and provide a reference for primary circuit design of the demonstration fast reactor.