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以国产百万千瓦级压水堆核电厂(CNP1000)的反应堆整体水力实验模型为对象,以实验工况为边界条件,开展堆芯下腔室导流围筒对流场影响的数值计算研究。使用计算流体力学(CFD)方法,通过堆芯流场验证计算和下腔室导流围筒多种孔径的流场计算分析,获得详细的堆芯内部流场流速与压力的分布情况,确定下腔室导流围筒对燃料组件入口流量分配、堆芯入口压力分布以及堆芯下腔室交混特性的影响,为堆芯内部结构的优化设计提供依据。
Taking the CNP1000 reactor’s overall hydraulic experimental model as an object, the numerical calculation research on the influence of core-chamber diversion scaffold on the flow field under the experimental conditions is carried out. Computational fluid dynamics (CFD) method was used to calculate and analyze the flow field of multiple bores in the flow field and the flow field through the core flow field. The flow field and pressure distribution in the core were obtained. The effect of the diversion enclosure on the flow distribution of the fuel assembly inlet, the pressure distribution at the inlet of the core and the mixing characteristics of the lower chamber of the core provides the basis for the optimal design of the internal structure of the core.