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采用3D激光多普勒测速装置研究了6×6棒束间的流场分布。实验选择了5种工况进行研究,雷诺数范围为6.6×103~7.03×104。其中6×6棒束试验段几何结构模拟相邻组件的布置方式。实验设置两种测量模式,第1种模式选择从试验段侧边测量,获得了距定位格架不同位置处的轴向速度和湍流强度的分布;第2种测量模式选择从试验段出口端面进行测量,获得了出口截面子通道间的三维速度和雷诺应力分布。通过对比不同雷诺数下的实验结果,分析了雷诺数对此次6×6棒束实验的影响。比较发现在雷诺数为6.6×103的情况下,存在低雷诺数效应。
The 3D laser Doppler velocimetry was used to study the flow field distribution in a 6 × 6 bundle. Five kinds of working conditions were chosen for the experiment, and the Reynolds number ranged from 6.6 × 103 to 7.03 × 104. The geometry of the 6 × 6 rod test section simulates the arrangement of adjacent components. Two kinds of measurement modes were set up experimentally. The first mode was selected from the side of the test section to obtain the distribution of axial velocity and turbulence intensity at different positions from the positioning grid. The second measurement mode was selected from the exit end of the test section The three-dimensional velocities and the Reynolds stress distribution between the subchannels at the exit cross section were obtained. By comparing the experimental results at different Reynolds numbers, the influence of Reynolds number on the experiment of 6 × 6 rod bundles was analyzed. It is found that there is a low Reynolds number effect when the Reynolds number is 6.6 × 103.