稳定蒸汽浸没射流冷凝传热系数评价

为分析稳定蒸汽浸没射流的传热特性，对3类典型冷凝传热系数开展评价。结果表明:平均传热系数实验值精度主要受界面面积计算模型影响，由冷凝驱动势和蒸汽质量流速表征的传统半经验关系式在不同孔径下的预测偏差较大，新增排放孔径为独立拟合变量的纯经验关系式适用范围更广且误差在±30%以内；界面传热系数的预测精度主要受汽羽微观参数取值的影响；由压力振荡主频表征的无量纲传热系数在低池水过冷度下与实验值偏差较大，关系式中纳入汽羽贯穿长度后，预测趋势与实验值类似。 

Evaluation of Condensation Heat Transfer Coefficient of Stable Steam Jet Submerged in Water

In order to analyze the heat transfer characteristics of a stable submerged steam jet, three types of condensation heat transfer coefficients (HTCs) were evaluated. The results show that the accuracy of the experimental values of the average HTC is mainly influenced by the calculation of the interfacial area, and the traditional semiempirical correlation (characterized by the condensation driving potential and the steam mass flux) has a large deviation from the prediction at different discharge diameters. A fully-empirical correlation with a wider applicable range can be obtained by adding the discharge diameter as independent fitting variable, and the discrepancy between prediction and experimental data is within ±30%. The accuracy of the interfacial HTC is mainly influenced by the microscopic parameters of the steam plume. The dimensionless HTC (characterized by the dominant frequency of pressure oscillation) deviates significantly from the experimental value at low water subcooling, and the predicted trend is similar to the experimental value when the steam plume penetration length is fitted in the correlation.