Development and Verification of a Comprehensive Rod Bundle CHF Mechanism Model
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摘要: 为了实现棒束通道中宽参数范围下偏离泡核沸腾（DNB）型和干涸（DO）型临界热流密度（CHF）的连续准确预测，采用棒束通道中的CHF分类准则和气泡湍流脉动下的过热液体层蒸干DNB型CHF机理模型，结合已经研究成熟的DO型CHF机理模型，建立了覆盖不同类型CHF的综合棒束CHF机理模型。采用中国核动力研究设计院（NPIC）的5×5全长棒束CHF实验数据对所建立的综合棒束CHF机理模型进行了验证，结果表明，综合棒束CHF机理模型所有的预测值/测量值（P/M）数据均匀地分布在1附近，最大相对偏差在±22%之内，说明开发的综合棒束CHF机理模型能够实现对棒束通道DNB型和DO型CHF的连续准确预测。
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关键词:
- 棒束通道 /
- 临界热流密度（CHF） /
- 机理模型
Abstract: In order to continuously and accurately predict departure from nucleate boiling (DNB) and dry-out (DO) type critical heat flux (CHF) under wide parameter range for rod bundle channel, a comprehensive rod bundle CHF mechanism model covering different types of CHF based on the CHF classification criterion in the bundle channel and the mechanism model of DNB type CHF for evaporation of superheated liquid layer and combined with the mature DO type CHF mechanism model that has been studied. The 5 × 5 full-length rod bundle CHF experimental data of Nuclear Power Institute of China (NPIC) is used to verify the CHF mechanism model of the comprehensive rod bundle. The results show that all predicted value/measured value (P/ M ) data of the comprehensive rod bundle CHF mechanism model are evenly distributed around 1, and the maximum relative deviation is within ± 22%, indicating that the developed comprehensive rod bundle CHF mechanism model can continuously and accurately predict the DNB and DO type CHF in rod bundle channel.-
Key words:
- Rod bundle channel /
- Critical heat flux (CHF) /
- Mechanism model
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图 2 DNB型CHF示意图
m—进入控制体的质量流量；$ \Delta {m_{{\text{evap}}}} $—蒸发的质量流量；$ {m_{{\text{turb}}}} $为湍流交混质量流量；T (y)—温度分布函数；D—通道等效直径；${{\Delta }}m$—质量流量的增量； ${{\Delta }}\textit{z}$—控制体高度
Figure 2. Schematic Diagram of DNB Type CHF
图 3 过热液体层厚度示意图
Tw—壁面温度；Tsat—液体饱和温度
Figure 3. Schematic Diagram of Superheated Liquid Layer Thickness
图 5 综合棒束CHF模型计算流程
Figure 5. Calculation Flow Chart of Comprehensive Rod Bundle CHF Model
图 6 TEST1、TEST5和TEST2系列P/M数据分布
Figure 6. Distribution of P/M Data in TEST1, TEST5 and TEST2
表 1 各组数据及其特征
Table 1. Each Group of Data and Its Characteristics
实验系列 栅元类型 轴向功率分布 格架布置类型 TEST1 典型 均匀 半跨 TEST2 典型 均匀 半跨 TEST5 典型 均匀 半跨 TEST7 导向管 均匀 全跨 TEST8 典型 均匀 全跨 
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