高温小球下落冷池运动机理的实验研究

An Experimental Study on the Movement Mechanism of the High-Temperature Particles Falling into the Coolant Pool

高温颗粒在粘滞性冷液中沸腾蒸发瞬变运动引发蒸汽爆炸是一个工程安全问题。利用实验室设计建造的高温颗粒下落冷池沸腾可视化实验装置,通过高速摄影记录小球在冷液中的下落全过程,分别进行了单个高温小球在不同粒径、不同温度和不同冷液过冷度条件下的一系列试验,并对实验结果进行了分析和讨论。文章指出,高温小球的温度、直径和冷液过冷度是影响小球运动速度的重要因素。

Extremely high rapid evaporation could occur when high-temperature particles contact with low-temperature liquid. This kind of phenomenon is associated with the safety of engineering and the problems in high-transient multi-phase flow and heat transfer. In this paper, a special visualized experiment facility for small-scale interaction of high-temperature particles with coolant has been set up in the laboratory and the whole processes of the particles falling down have been recorded by a high-speed video camera. A series of experiments of a particle with different diameters and temperatures, falling into different sub-cooled liquids have been carried out, and the results have been analyzed and discussed. It is pointed out that the temperature and diameter of high-temperature particles and sub-cooled liquid are the important factors to affect the movement of particles.