Experimental Study on Gas Entrainment at Free Surface in Reactor Vessel of a Compact Sodium-Cooled Fast Reactor
Experimental Study on Gas Entrainment at Free Surface in Reactor Vessel of a Compact Sodium-Cooled Fast Reactor
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DOI：
10.1080/18811248.2008.9711892
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发表时间：
2008-10
影响因子：
1.2
通讯作者：
N. Kimura;T. Ezure;A. Tobita;H. Kamide
中科院分区：
文献类型：
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作者：
N. Kimura;T. Ezure;A. Tobita;H. Kamide
作为快堆循环技术发展（FaCT）项目的一部分，对一种创新的钠冷快堆进行了研究。在反应堆中，设计了一个紧凑的反应堆容器（R/V），增加了钠流速，以降低建造成本。与这种设计相关的热工水力问题之一是R/V中自由表面处的气体夹带。在自由表面下方设置水平板以防止气体夹带。使用按1/1.8比例构建的部分模型进行水实验。目的是研究在一定条件下气体卷吸的发生和气体卷吸的机理。发现反应器内存在两种类型的气体夹带现象，其发生条件与额定条件相差甚远。一种类型的气体卷吸发生在尾流区的冷支管周围的流动，由于在R/V较大的水平速度。另一种类型的气体卷吸发生在热支管和R/V壁之间的区域时，冷却剂水平低，向下的速度大。通过对瞬态速度场的详细测量，阐明了两个区域的卷吸机理。
An innovative sodium-cooled fast reactor has been investigated as part of the fast reactor cycle technology development (FaCT) project. In the reactor, a compact reactor vessel (R/V) with increased sodium flow velocity was designedto reduce the construction cost. One of the thermal hydraulic problems associated with this design is gas entrainment at the free surface in the R/V. Horizontal plates are set below the free surface in order to prevent the gas entrainment. A water experiment was performed using a partial model built to 1/1.8 scale. The objective was to investigate the occurrence of gas entrainment under certain conditions and the mechanism of the gas entrainment. It was found that there were two types of gas entrainment phenomenon, and the conditions for their occurrence were far different from the rated condition in the reactor. One type of gas entrainment occurred at the wake region of flow around the cold leg pipe created due to the larger horizontal velocity in the R/V. The other type of gas entrainment occurred at the region between the hot leg pipe and the R/V wall when the coolant level was low and the downward velocity was large. The mechanisms of the gas entrainment at the two regions were clarified by the detailed measurement of transient flow velocity field.