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Time resolving gamma-tomography for periodically changing gas fraction fields and its application to an axial pump

机译：用于时间变化的气体分数场的时间分辨伽马层析成像及其在轴流泵中的应用

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摘要

In the paper a novel non-intrusive tomographic method is presented to visualise the gas fraction distribution inside the rotating impeller of an axial pump delivering a two-phase flow. The device has been developed for an axial pump (inducer), which has an impeller with three helical blades rotating at 1500 rpm. Model fluid is air-water mixture created by a gas distributor upstream the pump inlet nozzle. The developed gamma-tomography set-up consists of a Cs-137 source and an arc of 64 scintillation detectors. Each of the detectors is connected to a number of counters grouped into banks. Each bank is active only during a 100 μs long interval of the rotation period, which corresponds to a well-defined angular interval of the impeller rotation. A trigger pulse, generated at the beginning of each revolution, forces the control unit to restart the counting process from the first bank. In this way, the device is able to measure ensemble averaged projections of the gamma absorption density distribution, which are resolved according to the rotating angle of the impeller. An image reconstruction by filtered back-projection provides density distributions inside the impeller. Void fraction distributions are visualised by means of differential tomography, i.e. by subtracting sets of projections obtained for two-phase operation and for plain liquid.
机译：在本文中，提出了一种新颖的非侵入式层析成像方法，以可视化输送两相流的轴流泵的旋转叶轮内部的气体分数分布。该设备已开发用于轴流泵（感应器），该设备具有一个叶轮，该叶轮带有三个以1500 rpm旋转的螺旋叶片。模型流体是泵入口喷嘴上游的气体分配器产生的空气-水混合物。发达的伽马断层扫描装置由一个Cs-137源和一个由64个闪烁探测器组成的弧线组成。每个检测器都连接到分组为组的多个计数器。每个气缸组仅在旋转周期的100μs长间隔内有效，这对应于明确定义的叶轮旋转角度间隔。在每次旋转开始时产生一个触发脉冲，迫使控制单元从第一排重新开始计数过程。以这种方式，该装置能够测量γ吸收密度分布的整体平均投影，这些投影根据叶轮的旋转角度而解析。通过滤波后的反投影进行图像重建可在叶轮内部提供密度分布。空隙分数分布通过差动层析成像，即减去通过两相操作和普通液体获得的投影集而可视化。

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