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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。
Aiming at the bending structure of coolant channel in sub-critical energy cladding fuel zone and the corresponding operating conditions, a mechanism model is established to predict the critical heat flux density under localized channel tilt and the corresponding calculation program is developed. The model is validated by the experimental data under vertical and inclined conditions. The results show that the developed model has better calculation accuracy and wider applicability. The results show that the critical heat flux density increases obviously with the increase of local temperature and the deterioration of thermal conditions.