Dataset of PIV measurements for VVER Pressurized Water Reactor Rod Bundle Geometries including Spacer Grids for CFD Model Validations

A PIV test facility called PIROUETTE (PIv ROd bUndlE Test faciliTy at bmE) has been built at BME (Budapest University of Technology and Economics) NTI (Institute of Nuclear Techniques). The facility is capable of investigating of flow processes under isothermal conditions with different type triangular lattice seven-rod bundles. The currently investigated rod bundle is featuring spacer grids and hydraulic conditions related to the VVER-1000 and VVER-1200 fuel assemblies. For technical reasons, the geometry used here is a slightly enlarged version of the original geometry, which represents a 9.9% increase in D while maintaining the P/D ratio. This small bundle of 7 rods is a geometrically accurate representation of a piece of the real reactor's fuel bundle, including the spacer grids. These spacer grids were 3D printed from a special type of plastic for the PIV experiments in order to reproduce the real geometry inside the assemblies as accurately as possible. The effect of the spacer grids with vanes (which are located on the spacer grid belt section) was investigated using different test grid configurations. The detailed, high resolution experimental data could be used for CFD (Computational Fluid Dynamics) benchmarking and code validation, and therefore can serve the further safe and reliable operation of these type of reactors. The results include velocity field, velocity standard deviations (RMS), Reynolds stress and turbulent kinetic energy distributions extracted from the measured data. The results presented here include the 3D model of the measurement geometry and velocity distributions along various monitor lines from experiments. File Description Geometry files are provided under the name 'VVER-1200-FLUID_V1, VVER-1200-FLUID_V2 and VVER-1200-FLUID_V3' in three formats: StereoLithography (*.stl), STEP (*.stp), and Parasolid (*.x_t). Datafiles are available in excel format (*.xlsx). The data are organised in separate subfolders according to the different measurement cases. Each subfolder contains three excel files containing the results recorded in the three different planes. The nomenclature is as follows: the file VVER-1200_V3_P1_Monitor_Lines.xlsx contains the first set of monitor line velocities recorded on the "P1" position plane of the "VVER-1200" rod-bundle "V3" type spacer grid. The excel table contains 6 separate tabs covering velocity distributions recorded at distances 0.5, 1, 2, 3, and 5D distances. The first 0.5D tab also includes an explanatory figure and the data series are plotted on a graphs.匈牙利布达佩斯理工大学（Budapest University of Technology and Economics，BME）核技术研究所（Institute of Nuclear Techniques，NTI）搭建了一套名为PIROUETTE（BME旗下粒子图像测速（Particle Image Velocimetry，PIV）棒束试验装置）的PIV试验台架。该试验台架可针对不同类型的三角栅格七棒束开展等温条件下的流动过程研究。当前受试的棒束带有定位格架，其水力工况与VVER-1000、VVER-1200型燃料组件相匹配。出于技术考量，本次试验采用的几何模型相较原始几何存在小幅放大：直径D增大9.9%，同时保持节径比（P/D）不变。这套包含7根棒束的小型试验装置，可精准复现真实反应堆燃料棒束的局部几何特征，其中就包括定位格架结构。为尽可能精准还原燃料组件内部的真实几何形貌，本试验中的定位格架采用特种塑料通过3D打印制成。研究人员通过设置不同的试验格架配置方案，针对定位格架带段上的带翼定位格架的影响开展了试验。 本次试验获取的高精度详细实验数据可用于计算流体动力学（Computational Fluid Dynamics，CFD）的基准验证与程序校验，可为此类反应堆的安全可靠运行提供支撑。实验提取的结果包括速度场、速度标准差（均方根，RMS）、雷诺应力以及湍动能分布。本次公开的研究结果包含测量几何的三维模型，以及实验中多条监测线上的速度分布数据。 文件说明 几何文件以「VVER-1200-FLUID_V1、VVER-1200-FLUID_V2、VVER-1200-FLUID_V3」为名提供，包含三种格式：立体光刻格式（StereoLithography，*.stl）、STEP格式（*.stp）以及Parasolid格式（*.x_t）。数据文件采用Excel格式（*.xlsx）存储。数据按照不同试验工况划分至独立子文件夹中。每个子文件夹包含三个Excel文件，分别对应三个不同平面内的测量结果。命名规则如下：文件VVER-1200_V3_P1_Monitor_Lines.xlsx包含了「VVER-1200」型棒束「V3」型定位格架的「P1」位置平面内的第一组监测线速度数据。该Excel表格包含6个独立工作表，分别对应距离为0.5D、1D、2D、3D和5D位置处的速度分布。首个工作表「0.5D」中还附带了说明性图表，且数据序列已绘制于图中。