泄漏引发液体过热爆沸机理及规律研究

To explore the mechanism and law of liquid superheating and boiling caused by tank leakage, a small device was established to study the bubble evolution, pressure and medium superheat response during the bumping process. Upon the typical features of medium superheat degree, overheat time was further introduced to characterize the delay degree of boiling. The results show that a large number of bubbles were generated and grew rapidly in the medium after the vessel rupture. Bubble-growth process could be divided into a relatively stable stage and an accelerated stage, and the obvious pressure recovery was attributed to the accelerated growth of bubbles. According to the response of temperature sensors in the medium, the boiling occurred and spread from top to bottom and from the inner wall to the inside of the medium. And the medium underwent a cycle of supercoiling-saturation-superheat-saturation-supercooling during boiling. In addition, it was found that the increase of initial pressure and the decrease of initial liquid level could both improve the maximum superheat degree of medium, especially a maximum superheat of 9.4℃ with the initial liquid level of 50%. What's more, the ascent of the initial pressure or the initial liquid level also hold a significant lower overheat time. And the rise of the initial liquid level would contribute to a more serious rebound phenomena of pressure. On the basis of the overheat time obtained by experiments, the mathematical model of the overheat time was also verified. The results showed that the calculation of the mathematical model was basically consistent with the experimental data.