Assessment of LUT-2006 Subcooled CHF Prediction at PWR Conditions with Freon CHF Data
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摘要: 以R-134a为模化工质，在内径为8 mm的圆管中进行了临界热流密度（CHF）实验研究。讨论了R-134a的CHF参数变化趋势，评价了Katto的流体模化方法。结果表明，CHF仅受局部参数影响，长径比的影响可以忽略。R-134a的CHF参数趋势与典型水的CHF参数趋势相似。Katto的模化方法在低临界含气率甚至是负临界含气率下都有很高的精度。将R-134a的CHF实验数据通过模化方法转换成等效水数据，并与CHF查询表（LUT）-2006进行了比较。评价结果表明，即使在几乎没有过冷CHF数据的压水堆工况，LUT-2006仍具有很高的预测精度。
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关键词:
- 临界热流密度（CHF) /
- 氟利昂 /
- 流体模化 /
- CHF查询表（LUT）
Abstract: An experimental study on the critical heat flux (CHF) is carried out in a circular tube with an inner diameter of 8 mm using R-134a as the modeling working medium. The variation trend of CHF parameters of R-134a is discussed, and Katto’s fluid modeling method is evaluated. The results show that CHF is only affected by local parameters, and the influence of length-diameter ratio can be ignored. The CHF parameter trend of R-134a is similar to that of typical water. Katto's modeling method has high accuracy at low critical air content and even negative critical air content. The CHF experimental data of R-134a are converted into equivalent water data by modeling method and compared with CHF Lookup Table (LUT)-2006. The evaluation results show that LUT-2006 has high prediction accuracy even though there is almost no subcooled CHF data under PWR conditions.-
Key words:
- Critical heat flux (CHF) /
- Freon /
- Fluid-to-fluid modeling /
- CHF Look-up Table (LUT)
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图 2 不同加热长度下临界含气率xcr与CHF的关系
Figure 2. Relationship between Critical Air Content and CHF under Different Heating Lengths
图 3 不同压力P和质量流速G下临界含气率与CHF的关系
Figure 3. Relationship between Critical Air Content and CHF at Different Pressures and Mass Flow Rates
图 4 不同压力P和质量流速G下R-134a数据与水数据的比较
Figure 4. Comparison of R-134a Data with Water Data at different Pressures and Mass Flow Rates
图 6 各参数预测值与实验值之比
Figure 6. Ratio of Predicted and Experimental Values of Each Parameter
表 2 实验工况
Table 2. Experimental Conditions
参数 R-134a 水 压力/MPa 1.27~2.70 7.85~15.70 质量流速/ (kg·m−2·s−1) 1090~3550 1500~5000 进口温度/℃ 20~60 — “—”—无数据 
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表 3 实验不确定度分析
Table 3. Experiment Uncertainty Analysis
参数 不确定度/% 长度/直径/壁厚 ±0.1/±0.5/±3.0 压力 ±0.7 温度 ±1.3 质量流速 ±1.7 电压 ±0.2 电流 ±0.2 功率 ±2.2 热流密度 ±5.1
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表 4 Katto模化方法
Table 4. Katto’s Fluid-to-fluid Modeling Method
类型 无量纲数 几何相似 $ {\left( {\dfrac{L}{D}} \right)_{\text{R}}} = {\left( {\dfrac{L}{D}} \right)_{\text{w}}} $ 水力学相似 $ {\left( {\dfrac{{{\rho _{\text{l}}}}}{{{\rho _{\text{g}}}}}} \right)_{\text{R}}} = {\left( {\dfrac{{{\rho _{\text{l}}}}}{{{\rho _{\text{g}}}}}} \right)_{\text{w}}} $ 热力学相似 $ {\left( {\dfrac{{\Delta h}}{{{h_{{\text{fg}}}}}}} \right)_{\text{R}}} = {\left( {\dfrac{{\Delta h}}{{{h_{{\text{fg}}}}}}} \right)_{\text{w}}} 或 {\left( {{x_{{\text{cr}}}}} \right)_{\text{R}}} = {\left( {{x_{{\text{cr}}}}} \right)_{\text{w}}} $ We相同 $ W{e_{\text{R}}} = W{e_{\text{w}}} $ R—R-134a；w—水；We—韦伯数，$ We = {{\left( {G\sqrt D } \right)} \mathord{\left/ {\vphantom {{\left( {G\sqrt D } \right)} {\sqrt {{\rho _{\text{l}}}\sigma } }}} \right. } {\sqrt {{\rho _{\text{l}}}\sigma } }} $
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