蒸汽发生器传热管一、二次侧耦合换热及管外过冷沸腾数值研究

Numerical Investigation of Coupled Heat Transfer Between Primary and Secondary Side of SG Tube and Subcooled Flow Boiling on Secondary Side

摘要: 采用两流体欧拉数学模型，结合气相和液相之间的界面传热、传质和动量交换封闭模型以及RPI壁面沸腾模型，利用ANSYS CFX 12.0对蒸汽发生器局部传热管束二次侧的过冷沸腾进行数值研究。数值研究结果与单管内过冷沸腾实验数据对比验证符合良好。结果表明，采用壁面沸腾模型能准确预测沸腾起始点的位置，同时梅花孔板的存在对二次侧流动换热特性影响显著。

Abstract: Two fluid model combing with inter-phase heat and mass transfer model, inter-phase momentum transfer model, and RPI wall boiling model was applied to solve the local flow and heat transfer of subcooled flow boiling in the secondary side of SG tubes by using commercial CFD code ANSYS CFX 12.0. The numerical calculation results were validated by experimental data and calculation results. The results show that adopting RPI wall boiling model can predict the onset of subcooled flow boiling accurately, meanwhile the existence of orifice plate has a great effect on the flow and heat transfer characteristics of the secondary side.