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过冷沸腾蒸汽水两相流相分布特性计算对核反应堆的热工设计与安全分析非常重要。该研究建立了计算过冷沸腾真实含汽率的非线性热平衡微分方程;基于在过冷沸腾起始点和饱和沸腾起始点分别存在2个拐点的特点,提出了高、低入口过冷度工况下沸腾流道内真实含汽率计算模型,模型中同时给出了饱和沸腾起始点的计算公式。根据该模型获得真实含汽率后可采用漂移流模型得出真实空泡率。在较大的压力、质量流速和热流密度工况范围内的该模型计算结果与现有的大量蒸汽水空泡率实验数据一致性较好。
Subcooled boiling steam two-phase phase flow characteristics of the calculation of the nuclear reactor thermal design and safety analysis is very important. Based on the characteristics of two inflection points at the beginning of subcooled boiling and the initial boiling point of saturation boiling, the paper proposed high and low inlet subcooling conditions The calculation model of the real steam content in the boiling channel is given, and the calculation formula of the starting point of the saturation boiling is also given in the model. According to the model obtained after the real steam content drift drift model can be used to derive the true vacuolar rate. The calculated results of the model under the conditions of large pressure, mass flow rate and heat flux density are in good agreement with the experimental data of a large amount of existing water vapor vacuoles.