通道局部倾斜效应对临界热流密度特性影响理论研究

Theoretical Study on Effect of Flow Channel Local Inclination on Critical Heat Flux

针对次临界能源包层燃料区冷却剂通道的弯曲结构及相应的运行工况,建立能够预测通道局部倾斜条件下临界热流密度的机理模型,并开发相应的计算程序。采用竖直和倾斜条件下实验数据对模型进行了验证,验证结果表明所开发模型具有较好的计算精度和较宽的适用范围。利用程序对通道局部倾斜效应作用下的临界热流密度变化规律进行计算分析,结果表明:随着局部倾斜角度的增加和热工工况的恶化,临界热流密度相对竖直通道的降低幅度明显增加。

The present work aims at the curved structure of coolant flow channel and corresponding operation conditions in the subcritical energy blanket of fusion-fission hybrid reactor. The critical heat flux （CHF） model is established for the local inclined channel and corresponding code is developed. Then the model is verified with experimental data under both vertical and inclined conditions. The results show that the present model has good prediction accuracy in a wide parameter range. After that, the local inclination effect on CHF is investigated using the developed code. The results show that with the increasing of the local inclination angle and worsening thermal-hydraulic conditions, the CHF ratio of local-inclined to vertical flow channel decreases.