基于COSINE软件包子通道软件的换热模型和氧化关系式适应性研究

Study on Adaptability of Heat Transfer Model and Oxidation Relationships Based on COSINE Sub-channel Code

针对压水堆核电子通道软件中换热模型和氧化关系式对提高堆芯安全性和国产化软件模拟预测准确性的急迫需求,采用数值模拟技术在COSINE软件包子通道软件中分析换热模型和氧化关系式,并运用实验数据研究了不同理论关系式对沸腾换热性能和氧化量的影响。结果表明,该软件具有模拟棒束内临界前后换热模型的能力,其模拟结果和实验值吻合良好。在过热度小于4K前,MAX模型计算核态沸腾适用性较好;在过热度大于4 K后,PLUS模型适用性较好。Dougall-Rohsenow模型计算膜态沸腾适用性较好。Baker-Juster模型在温度低于1374K前,略微高估氧化量;在温度高于1374K后,低估氧化量。

In view of the urgent need of heat transfer model and oxidation relationships in pressurized water reactor nuclear subchannel software to improve the core safety and the accuracy of simulation and prediction of domestic software,we used numerical simulation technology to analyze the heat transfer model and oxidation relationships in COSINE subchannel software,and used experimental data to study the influence of different theoretical relationships on boiling heat transfer performance and oxidation amount.The results indicate that the software has the ability to simulate the heat transfer before and after the criticality in the rod bundle,and the simulation results are in good agreement with the experimental values.Before the superheat degree is less than 4 K,the MAX model is suitable for calculating nucleate boiling.When the superheat degree is greater than 4 K,the PLUS model has good applicability.Dougall-Rohsenow model is suitable for calculating film boiling.Baker-Juster model slightly overestimated the oxidation amount before the temperature was lower than 1374 K;When the temperature is higher than 1374 K,the oxidation amount is underestimated.