【摘要】 本文报告了使用R-12作工质进行的自然循环过冷沸腾净蒸汽产生点的实验结果。实验过程中使用可视化方法观察确定过冷沸腾净蒸汽产生点。在相当宽广的工质压力、入口过冷度及加热功率范围内研究了上述参数对过冷沸腾净蒸汽产生点的影响。实验结果证实,对自然循环流动,汽泡所受的浮升力对净蒸汽产生点的汽泡的脱离有重要影响。据此,本文提出了使用同时考虑浮升力作用的修正的Levy模型计算自然循环过冷沸腾净蒸汽产生点的计算方法。更多还原

【Abstract】 This paper presents the experimental study on the point of net vapor generation in a natural circulation system with subcooled boiling. Freon-12 was used as the working medium. The point of net vapor generation was determined by visual observation. The influence of the system pressure, inlet subcooling of the working medium and the heat input power to the heated section on the point of net vapor generation were investigated in the experiments. It is found from the data reduction that the buoyancy to the bubbles has great influence on the point of net vapor generation. The empirical correlation to calculate the point of net vapor generation for natural circulation with subcooled boiling by using modified Levy model was presented.更多还原