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基于计算流体动力学(CFD)分析方法,采用流固共轭传热方式,对非能动堆芯冷却系统(PXS)的堆芯补水箱(CMT)热态功能试验、CMT注入同时自动减压系统(ADS)动作、蓄压安注箱(ACC)安注后CMT再注入以及常规余热排出系统运行等4种工况下反应堆压力容器(RPV)环腔内流动传热状态进行瞬态数值模拟,研究RPV壁面温度瞬态变化以及环腔下降段内流体的混合特性。结果表明:4种工况下直接安注(DVI)接管管嘴与RPV内壁面相交斜面处冷却水混合剧烈,冷段是否有流体注入环腔对其内流体温度分布变化影响巨大,且DVI接管管嘴局部区域将发生较大的温度变化。
Based on the computational fluid dynamics (CFD) analysis method, the thermal functional test of core replenishment tank (CMT) of passive core cooling system (PXS) was carried out using the fluid-solid conjugate heat transfer method. Simultaneously, (ADS) action, CMT re-injection after ACC injection, and conventional waste heat removal system operation, the instantaneous numerical simulation of heat transfer in the annular cavity of reactor pressure vessel (RPV) The transient changes of the wall temperature of RPV and the mixing characteristics of fluid in the descending section of the annular cavity were studied. The results show that the mixing of the cooling water in the slope of the cross pipe between the DVI pipe nozzle and the RPV inner wall surface is drastic. In the cold section, whether the fluid is injected into the annular cavity has a great influence on the temperature distribution inside the pipe. Large area of the nozzle will occur greater temperature changes.