Ｔhree-dimensional flow measurement of a water flow in a sphere-packed pipe by digital holographic PTV
Ｔhree-dimensional flow measurement of a water flow in a sphere-packed pipe by digital holographic PTV
复制标题
利用数字全息 PTV 对球填充管道中的水流进行三维流量测量
DOI：
10.1016/j.fusengdes.2015.03.023
复制
发表时间：
2015
影响因子：
1.7
通讯作者：
M. Enoeda
中科院分区：
文献类型：
--
作者：
S. Satake;Y. Aoyagi;N. Unno;K. Yuki;Y. Seki;M. Enoeda
用于核聚变反应堆 ITER 和 DEMO 的水冷陶瓷增殖器在包层模块的设计中发挥着重要作用。陶瓷氚增殖器的卵石被装在毯子的容器中。在设施的实际环境中，在复杂的流动下（例如用于卵石床的容器的情况下）会发生压降，因此有必要研究流动行为。为了开发设施，必须能够监测基本流的流体运动，例如球填充管道（SPP）。在本研究中，为了辨别 SPP 中的复杂流动结构，使用水作为工作流体，通过折射率匹配方法进行数字全息 PTV 可视化。选择的水能够调整其折射率，以与折射率为 1.33 的 MEXFLON 卵石的折射率相匹配。可以观察球体后面粒子的全息条纹图像，并且可以通过数字全息图重建粒子的位置。因此，球体周围的 3D 速度场是通过重建粒子的位置获得的。发现卵石之间的速度是 SPP 中的收敛和发散区域。
A water cooled ceramic breeder for ITER and DEMO of a nuclear fusion reactor plays a significant role in the design of a blanket module. Pebbles of a ceramic tritium breeder are packed in a container of the blanket. Investigation of the flow behavior is necessary in an actual environment of a facility where pressure drop takes place under a complex flow such as in case of the container for the pebble bed. For the development of a facility, it is necessary to be able to monitor fluid motion of a basic flow such as a sphere-packed pipe (SPP). In the present study, to discern the complex flow structures in SPP, digital holographic PTV visualization is carried out by a refractive index-matching method using a water employed as a working fluid. The water is chosen to be able to adjust its refractive index to match to that of the MEXFLON pebble with an index of 1.33. Hologram fringe images of particles behind the spheres can be observed, and the particles’ positions can be reconstructed by a digital hologram. Consequently, 3-D velocity-fields around the spheres are obtained by the reconstructed particles’ positions. The velocity between pebbles is found to be convergence and divergence regions in the SPP.