半球体窄缝通道流动换热与冷却能力试验

发布时间：2019-01-20 20:55

【摘要】：在美国TMI-2发生严重事故时,反应堆下封头内累积了大量的熔融物,经过一段时间观察,下封头未被熔融物熔穿。因此提出了一些可能的冷却机理,其中间隙冷却机理被认为是最有可能的一种。本文进行了窄通道流动换热与冷却能力的试验,旨在探索窄缝的传热机理和冷却能力。试验中半球形采用向下加热,并观察流动换热现象。在分组试验过程中窄缝间隙选取为2mm和4mm两种,采用不同的加热功率对铜球进行加热。试验结果表明:在窄通道试验中,冷却过程与壁面加热、间隙大小有着不可分割的关系;壁面温度对窄通道冷却有着较大的影响;在窄通道流动换热与冷却过程中,对于单相对流换热,强制对流冷却的效果大于自然对流的冷却效果;对于多相对流换热,强制对流的冷却效果也大于自然对流的冷却效果。
[Abstract]:During the serious accident of TMI-2 in the United States, a large amount of molten matter accumulated in the reactor head. After a period of observation, the lower head was not melted through by the melt. Therefore, some possible cooling mechanisms are proposed, among which the gap cooling mechanism is considered to be the most likely. In this paper, the heat transfer and cooling capacity of narrow channel flow is tested to explore the heat transfer mechanism and cooling capacity of narrow gap. In the experiment, the hemispherical shape was heated downward and the flow heat transfer was observed. In the process of grouping test, the narrow gap is selected as 2mm and 4mm, and the copper ball is heated with different heating power. The results show that the cooling process is closely related to the wall heating and the gap size in the narrow channel test, and the wall temperature has a great influence on the cooling of the narrow channel. In the process of flow heat transfer and cooling in narrow channel, the effect of forced convection cooling is greater than that of natural convection for single-phase convection heat transfer, and the cooling effect of forced convection is greater than that of natural convection for multi-relative flow heat transfer.
【作者单位】：西安交通大学能源与动力工程学院核反应堆热工水力实验室;
【基金】：高等学校博士学科点专项科研基金类资助项目(20110201110036)
【分类号】：TL364.4;TL33

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