【摘要】 基于一维稳态两相分离流模型,并引入低流速过冷沸腾净蒸汽产生点方法,建立熔融物堆内滞留(IVR)条件下的两相流动数值计算模型,以获取两相流真实含气率。通过对比ULPU-V试验中自然循环流量,验证数值计算模型预测结果的准确性。针对AP1000堆型,分析几何结构参数和热工参数对其IVR策略中自然循环流量的影响。分析结果显示,冷却水过冷度、流道间隙、堆腔淹没水位、流道入口面积和出口阻力系数对自然循环过程有着不同程度的影响,自然循环稳态流量呈现出不同的变化趋势。更多还原

【Abstract】 Based on the one-dimensional steady-state separated flow model and low-velocity subcooling model of net void generation(NVG) point, a method to study the characteristics of the natural circulation flow in the annular channel under condition of in-vessel retention has been established. The results are compared with the ULPU-V experiments which measured the natural circulation flow rates to verify the reliability and correctness of the numerical calculation model established in this work. The effects of configuration parameters and thermal-hydraulic parameters on the natural circulation for in-vessel retention of AP1000 are analyzed. The results show that the water subcooling, flow channel size, flooding levels, inlet area and loss coefficients of riser outlet have a dominant effect on the natural circulation flow rate. And the natural circulation flow rate shows various variation tendencies along with those parameters due to the driven forces and flow resistance.更多还原