自然循环过冷沸腾截面平均空泡份额实验与计算方法研究

Predictive and Experimental Study of Cross-Section Average Void Fraction in Sub-cooled Boiling with Natural Circulation

采用RBI高温高压光学探针,对自然循环过冷沸腾截面平均空泡份额进行了实验研究。通过实验数据与应用较为普遍的Saha模型、Levy模型以及孙奇提出的真实质量含汽率模型计算值的比较发现,基于强迫循环实验数据的截面平均空泡份额计算模型无法适用于自然循环工况,且经过比较初步判定相同系统参数下高过冷沸腾区自然循环较强迫循环空泡份额偏高。另外,根据模型的比较分析结果对真实质量含汽率模型进行了拓展,使其可适用于自然循环过冷沸腾工况。

Sub-cooled average void fraction in natural circulation is investigated using high-temperature high-pressure RBI optical probe in this paper. The experimental data are compared with the existing Saha model, Levy model and Sun mass true quality model. The result shows that these models based on forced circulation do not fit in the natural circulation. The analyses of the experimental data in this paper indicate that the void fraction in natural circulation is higher than that in forced circulation. In addition, the Sun mass true quality model is improved in this paper, and the improved model agrees quit well with the experimental data in natural circulation.