Simplification of Critical Criteria for Reverse Flow Determination Based on Reverse Flow Theory Model of U-Tube Steam Generator
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摘要: 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。Abstract: 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.
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Key words:
- Steam generator /
- Reverse flow /
- Theoretical model /
- Criteria
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图 1 UTSG倒流特性的理论分析模型
m—外部加热回路的质量流量，kg/s；H—U型管进出口位置与热源的标高，m；x 为沿主流方向的管内流体坐标，m； pin、pout 分别为U型管进、出口压力，Pa；ui为一维流体流速，m/s；Tin、Tout分别为U型管进、出口温度，K
Figure 1. Theoretical Analytical Model for Reverse Flow Characteristics in UTSG
图 5 理论模型及简化判定准则的验证
Figure 5. Verification of Theoretical Models and Simplified Criteria
表 1 实验工况范围
Table 1. Ranges of Experimental Operating Conditions
参数名 参数值 实验压力/MPa 1 一次侧入口温度/℃ 90、105、120、135、148.5、150、
151.5、154.5、157、160.5一回路总流量/(t·h−1) 0.096~0.108 二次侧流量/(t·h−1) 37 二次侧温度 常温 电动调节阀阻力系数 766.81 阀门开度/% 13.5 
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