应用相似原理,根据工程需要,采用1:5比例设计整体水力模型。对堆芯与上腔室几何形状,经过工程分析,考虑欧拉准则Eu与雷诺准则Re关系,在Re数等于自模Re数时(模型Re取10~5,足够保证自模),可使模型的欧拉数(阻力系数)与原型的相等。堆芯由模拟燃料组件组成以模拟原型的阻力系数,这些组件由具有同心流动通道的正方形横截面的铝棒制造。模拟燃料组件的个数、排列方式与原型相同,使流量分布数据有一一对应关系。所有模拟燃料组件在整体水力试验之前,逐个按阻力系数相等于原型的阻力系数进行标定。对工程设计的两块实心比为0.438和0.7的流量分配板进行了试验,测量了堆芯流量分布并归并成归一化流量分布,还测量了从反应堆进口,经堆芯到上腔室出口的模型各部分阻力系数。通过试验分析和比较,选择实心比为0.7的流量分配板,其堆芯流量分布对应的下腔室流量分配分因子为1.05,和工程取值一致,也和国外数据相符,它可用于秦山核电厂反应堆设计。 Applying the principle of similarity, the overall hydraulic model is designed in a 1: 5 scale according to the needs of the project. For the geometry of the core and the upper chamber, after engineering analysis, considering the relation between the Euler criterion Eu and the Reynolds criterion Re, when Re is equal to the Reynolds number (Re is 10 ~ 5, enough to ensure self-die) The Euler number (drag coefficient) of the model is equal to the prototype. The core consists of a simulated fuel assembly to simulate the drag coefficient of the prototype made from an aluminum rod with a square cross-section with concentric flow channels. The number of simulated fuel assemblies is arranged in the same way as the prototype, so that the flow distribution data has one-to-one correspondence. All simulated fuel assemblies were calibrated one by one prior to the overall hydrodynamic test by drag coefficients equivalent to those of the prototype. Two engineered flow distributor plates with solid ratios of 0.438 and 0.7 were tested and the core flow distribution was measured and integrated into a normalized flow distribution. The flow from the reactor inlet to the outlet of the upper chamber through the core was also measured The drag coefficient of each part of the model. Through experimental analysis and comparison, the flow distribution plate with a solid ratio of 0.7 is selected. The sub-chamber flow distribution factor corresponding to the distribution of core flows is 1.05, which is consistent with the engineering value and also with the foreign data. It can be used in Qinshan Nuclear Power Plant Factory reactor design.