压水堆堆芯临界热流密度的预测方法综述

Review of Critical Heat Flux Prediction Methods in Pressurized Water Reactors

针对压水堆堆芯临界热流密度(CHF)预测这一重要科学问题,分析了棒束中存在的格架效应、冷壁效应和非均匀加热效应对CHF的影响,对比了基于不同假设的6类CHF机理模型,给出了棒束CHF关系式的开发途径,并得出了CHF机理模型和经验关系式在棒束CHF预测上的优缺点。建议进一步充实已有的CHF实验数据库,优化CHF关系式的开发方法,并积极开发棒束CHF机理模型。

In order to accurately predict the critical heat flux(CHF)in pressurized water reactor core fuel assembly,the effects of spacer grids,cold walls and non-uniform heat flux in rod bundles on CHF are analyzed.Simultaneously,six CHF mechanism models based on different physical hypothesis are comparatively researched,and the development methods for CHF correlations are put forward.Advantages and disadvantages of CHF mechanism models and empirical correlations in the prediction of bundle CHF are obtained.It is suggested that the expanding of existing CHF experimental database,the optimizing of development methods of CHF correlations,and the developing of rod bundle CHF mechanism models shall be carried out.