Experimental two-phase flow measurement using ultra fast limited-angle-type electron beam X-ray computed tomography
Experimental two-phase flow measurement using ultra fast limited-angle-type electron beam X-ray computed tomography
复制标题
使用超快有限角型电子束 X 射线计算机断层扫描进行实验两相流测量
DOI：
10.1007/s00348-009-0617-6
复制
发表时间：
2009
影响因子：
2.4
通讯作者：
U. Hampel
中科院分区：
文献类型：
--
作者：
M. Bieberle;F. Fischer;E. Schleicher;D. Koch;H.;H. Mayer;U. Hampel
本文报道了一种新型有限角度型超快电子束 X 射线计算机断层扫描方法的实验评估，该方法用于气液两相流的可视化和测量。通过这种方法，使用简单的线性电子束扫描来生成流动回路的管段中两相流的瞬时射线照相视图。电子束扫描可以非常快速地执行，因此可以实现 5 kHz 的帧速率。射线照相投影由由锌-镉-碲化物元素制成的非常快的探测器弧记录。该探测器以 1 MHz 的采样率记录穿过物体的 X 射线辐射。从记录的探测器数据重建切片图像是一个有限角度问题，因为在我们的扫描几何结构中，物体的氡气空间仅被不完全采样。这里研究了该技术是否能够从气泡两相流中产生准确的气体分数数据。实验在具有已知几何形状的有机玻璃模型和电子束处理箱中真空条件下运行的实验流动回路上进行。
An experimental evaluation of a novel limited-angle-type ultra fast electron beam X-ray computed tomography approach for the visualization and measurement of a gas–liquid two-phase flow is reported here. With this method, a simple linear electron beam scan is used to produce instantaneous radiographic views of a two-phase flow in a pipe segment of a flow loop. Electron beam scanning can be performed very rapidly, thus a frame rate of 5 kHz is achieved. Radiographic projections are recorded by a very fast detector arc made of zink–cadmium–telluride elements. This detector records the X-ray radiation passing through the object with a sampling rate of 1 MHz. The reconstruction of slice images from the recorded detector data is a limited-angle problem since in our scanning geometry the object’s Radon space is only incompletely sampled. It was investigated here, whether this technology is able to produce accurate gas fraction data from bubbly two-phase flow. Experiments were performed both on a Perspex phantom with known geometry and an experimental flow loop operated under vacuum conditions in an electron beam processing box.