轴向非均匀加热DNB型临界热流密度理论预测  

Theoretical Research on DNB-type Critical Heat Flux with Non-Uniform Axial Heat Flux Distribution

作　　者：赵大卫[1] 刘文兴[1] 熊万玉[1] 昝元峰[1] 杨祖毛[1] 

机构地区：[1]中国核动力研究设计院中核核反应堆热工水力技术重点实验室,成都610041

出　　处：《核动力工程》2016年第1期18-22,共5页Nuclear Power Engineering

基　　金：国家青年科学基金项目(51406189)

摘　　要：基于微液层蒸干的临界触发机理,构建非均匀加热下的偏离核态沸腾(DNB)型临界预测模型。模型通过对临界触发点上游的非均匀热流分布进行沿程积分来确定临界位置附近的局部热工水力特性,通过临界点当地热流密度作用下汽块覆盖的微液层是否蒸干判断临界的发生,结合轴向功率分布曲线在流道沿程进行搜索来获取临界发生位置,最终实现了对轴向非均匀加热下DNB型临界热流密度的理论预测。分别采用入口峰、中间峰及出口峰功率曲线下的临界实验结果对该模型及功率因子修正法的预测能力进行对比验证。相对于功率因子修正法,所构建非均匀加热临界模型在3种不同功率曲线分布下均展示了较为准确的临界值和临界位置预测能力,其预测结果要优于功率因子修正法。Based on the liquid sublayer dryout mechanism, an improved mechanistic DNB-type critical heat flux（CHF） model has been developed for non-uniform axial heat flux distribution. In this DNB-type critical heat flux model, the non-uniform heat flux in axial is taken into account of upstream memory effect on thermalhydrlics characters at boiling crisis point; the boiling crisis is triggered when the liquid sublayer undemeath vapor blanket is completely dried out by the local heat flux on the wall; and the position of boiling crisis is confirmed by comparing the CHF predictions at each potential boiling crisis points. The prediction results of the present CHF model and empirical correlations with correction factors are verified by non-uniform heating CHF experimental results, which are obtained with inlet-peak, center-peak and outlet-peak power profiles. The comparisons show the present model has more reasonable capability on predicting DNB-type CHF and boiling crisis position under non-uniform heating condition than the correction factor method.

关 键 词：临界热流密度 轴向非均匀加热 微液层蒸干模型 偏离核态沸腾(DNB) 

分 类 号：TL33[核科学技术—核技术及应用]