氟利昂CHF数据对压水堆工况下LUT-2006过冷CHF预测能力的评估

Assessment of LUT-2006 Subcooled CHF Prediction at PWR Conditions with Freon CHF Data

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。

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.