为有效预测高压条件下矩形窄缝通道内的过冷沸腾传热系数，基于试验数据，对现有传热模型进行了评估，分析影响其预测效果的原因，并提出了新的预测关联式。所选数据是在截面尺寸60×2 mm的矩形窄缝通道内进行的，工况参数覆盖了板状燃料堆芯的实际运行工况，包括：压力p = 10–16 MPa，质量流速G = 500–1500 kg?m-2?s-1，热流密度q = 100–300 kW?m-2，流体过冷度ΔTsub = 0–37 °C。结果表明：充分发展沸腾的壁面过热度模型与本文的传热系数吻合较好，但大部分预测关联式会低估高压时的传热系数，同时在接近饱和点的低过冷区域，预测偏差也较大；强化类型传热关联式的预测效果不佳，影响预测偏差的主要因素为应用工况和通道条件。通过对实验数据进行线性回归分析，提出一个区分高低过冷度区间的壁面过热度模型，该模型的预测性能较为理想，平均绝对误差为3.54%，可为高压矩形窄缝通道的传热设计提供技术指导。

To effectively predict the heat transfer coefficient of subcooled boiling in narrow rectangular channels under high pressure, the existing heat transfer models were evaluated based on experimental data. The present study analyzes the reasons that affect the prediction effect, and proposes a new prediction correlation. The selected experimental data were carried out in a narrow rectangular narrow channel with a cross-section size of 60×2 mm. The test parameters cover the actual operating conditions of the plate-type fuel core assembly, including: pressure p=10-16 MPa, mass flux G=500-1500 kg?m-2?s-1, heat flux q=100-300 kW?m-2, and subcooled temperature ΔTsub = 0–37 °C. The results show that the wall superheat models for fully developed boiling are in accordance with the heat transfer coefficient of this study, while most predictive correlations underestimate the heat transfer coefficient at high pressure. Besides, there is also a large prediction deviation in the low subcooling region near the saturation point. The prediction effects of enhanced heat transfer correlations are not satisfactory, and the main factors affecting prediction deviation are operating conditions and channel geometries. By conducting linear regression analysis on the experimental data, a wall superheat model that distinguishes between high and low subcooling ranges is proposed, The predictive performance of this model is ideal with a MAE of 3.54% and can provide technical guidance for the heat transfer design of high-pressure narrow rectangular channels.

中央高校基本科研业务费专项资金项目(2023MS118)