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对蒸汽发生器一次侧进、出口管嘴的缩比模型进行了局部阻力试验,获得了进、出口管嘴的局部阻力系数.对进、出口管嘴试验模型分别建立结构网格,选用剪切应力输运(SST)湍流模型,采用Fluent软件进行了流场分析计算.结果表明:数值模拟得到的进、出口管嘴局部阻力系数与对应工况下试验结果的相对误差小于5%;随着进口管嘴与筒体轴线角度的增大,进口管嘴的局部阻力系数明显增大,在满足安装工艺的条件下,建议选用较小的进口接管角度;蒸汽发生器传热管管板进口区域的流场和压力分布均一性较差,会对蒸汽发生器各管内的质量流率分配产生不利影响;出口管嘴两出口接管的压差不平衡对体积流量分配的影响较显著.
The partial resistance test was carried out on the contraction ratio model of primary side and outlet nozzle of steam generator, and the local resistance coefficient of inlet and outlet nozzles was obtained.The structure grids were established respectively for the inlet and outlet nozzle test models, (SST) turbulence model and the Fluent software was used to analyze the flow field.The results show that the relative error between the local resistance coefficient of the inlet and outlet nozzles and the test results under the corresponding conditions is less than 5% Import nozzle and the cylinder axis angle increases, the local resistance coefficient of the nozzle increases significantly to meet the installation process conditions, it is recommended to choose a smaller inlet pipe angle; steam generator heat pipe plate inlet area The uniformity of flow field and pressure distribution is poor, which will have an adverse effect on the mass flow rate distribution in the tubes of the steam generator. The unbalanced pressure difference between the two outlet nozzles of the outlet nozzle has a significant impact on the volume flow distribution.