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为研究球床高度对球流运动特性的影响,根据相似准则的原理建立高温气冷堆二维堆芯的球流运动试验系统,利用标志球的实验方法对球流运动规律进行研究。对1 m和2 m本体球流运动的均值流线、内部流场、标志球的平均滞留时间,以及交混区的球流的分布特征和分布区域等进行比较分析。结果表明:二维流动均值流线是光滑对称的流线型,球床边缘和中心的流动相差很大,球床下部的流动不均匀性比上部不均匀性大;增大装球高度球流可以达到更大的分散程度。验证交混区球的高斯分布;标志球的运动区域具有两头小中间大的特点;2 m本体的球床下部的流动均匀性优于1 m本体。
In order to study the influence of the height of ball bed on the characteristics of ballistic movement, a ballistic movement test system of two-dimensional core in HTGR was established according to the principle of similarity criterion. The law of ball movement was studied by using the ball test method. The mean streamline, internal flow field, average residence time of the marked ball and distribution characteristics and distribution area of the ball flow in 1 m and 2 m bodies are compared. The results show that the two-dimensional flow average streamline is a smooth and symmetrical streamline, the difference of the flow between the edge of the ball bed and the center is large, and the flow inhomogeneity in the lower part of the ball bed is larger than that in the upper part. Greater degree of dispersion. The Gaussian distribution of the ball in the cross-mixing zone is verified. The movement area of the marker ball has the characteristics of two small middle and large spots. The flow uniformity of the lower part of the 2-m body is better than that of the 1-m body.