基于U型管式蒸汽发生器倒流理论模型的倒流临界简化判定准则

Simplification of Critical Criteria for Reverse Flow Determination Based on Reverse Flow Theory Model of U-Tube Steam Generator

在U型管倒流问题中,倒流临界点的准确判断较为重要。本文建立了U型管倒流特性的理论分析模型,并基于理论分析模型对倒流临界判定准则进行了简化,将倒流理论分析模型和倒流临界简化判定准则的计算结果与实验结果进行对比。结果表明,倒流理论分析模型和倒流临界简化判定准则的计算结果与实验结果符合较好,平均相对误差的绝对值分别为3.4%和3.7%,说明倒流理论分析模型和倒流临界简化判定准则对倒流点预测结果较为准确。

In the problem of U-tube reverse flow,accurate determination of the critical point of reverse flow is quite important.In this paper,a theoretical analysis model of U-tube reverse flow characteristics was established,and the criticality criterion of reverse flow based on the theoretical analysis model was simplified.The calculation results of the theoretical analysis model and the simplified reverse flow critical criterion were compared with the experimental results.The results showed that the calculation results of the reverse flow theoretical analysis model and the simplified reverse flow critical criterion were in good agreement with the experimental results,and the absolute values of the average relative errors were 3.4%and 3.7%,respectively.It showed that the theoretical analysis model of reverse flow and the simplified reverse flow critical criterion were more accurate for the prediction results of reverse flow point.