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本文描述一种测量狭窄通道中水速分布的新技术,并用这种激光多普勒测速技术测量了反应堆燃料组件全尺寸模型几排棒束之间宽约3mm、深200mm间隙内的水流速度分布。在几个截面上,于不同流量下,取得了详细的实验数据,并对其进行了初步分析。激光多普勒测速技术显示了它许多独特的优点:非接触测量,不干扰流场;空间分辨率高,可以测量小区域内的流速分布;在保证精度的同时,测量方便,移动迅速;一般在45min内就可测出75点的流速,每点读数十次,得到一条线上的流速分布。
This paper describes a new technique to measure the velocity distribution of water in a narrow channel and uses this laser Doppler velocimetry technique to measure the velocity distribution of water flow across a width of about 3 mm and a depth of 200 mm between several rows of bundles of a full-scale reactor fuel assembly . In several sections, at different flow rates, obtained detailed experimental data, and carried out a preliminary analysis. Laser Doppler velocimetry shows many of its unique advantages: non-contact measurement without disturbing the flow field; high spatial resolution, allowing measurement of flow velocity distribution in small areas; convenient measurement and rapid movement while maintaining accuracy; 45min can be measured within 75 points of the flow rate, each point of readings dozens of times to get a line of flow velocity distribution.