Investigation of free-surface fluctuations of liquid lithium flow for IFMIF lithium target by using an electro-contact probe
Investigation of free-surface fluctuations of liquid lithium flow for IFMIF lithium target by using an electro-contact probe
复制标题
DOI：
10.1016/j.fusengdes.2007.07.056
复制
发表时间：
2007-10
期刊：
影响因子：
--
通讯作者：
T. Kanemura;H. Kondo;N. Yamaoka;S. Miyamoto;M. Ida;H. Nakamura;I. Matsushita;T. Muroga;H. Horiike
中科院分区：
文献类型：
--
作者：
T. Kanemura;H. Kondo;N. Yamaoka;S. Miyamoto;M. Ida;H. Nakamura;I. Matsushita;T. Muroga;H. Horiike
在国际聚变材料辐照装置（IFMIF）中，利用40 MeV氘束注入高速液态锂（Li）平面射流，沿沿着垂直凹壁在真空中流动，产生14 MeV中子。锂喷流必须是稳定的，以产生稳定的中子场，而自由表面流预计是不稳定的。为了确保可靠的操作，详细了解Li流是非常重要的。利用Li环装置对Li流进行了实验，以确定表面振荡的大小。该回路的试验段是IFMIF设计的1/2.5比例，产生深10 mm、宽70 mm的平面射流，自由表面的速度范围高达15 m/s。在本研究中，采用了一种称为电接触探针的表面检测装置。这种仪器使我们能够直接测量表面振荡。用电接触探针测得，在平均速度为15 m/s时，在喷嘴出口下游175 mm处的表面振荡幅度为2.2 ~ 2.9mm。这是第一次详细测量。这些数值被认为是改进了IFMIF的实际目标。估算表明，在不考虑表面尾迹影响的情况下，2.9mm的现有数据可以转化为更小的数值。
In the international fusion materials irradiation facility (IFMIF), 14MeV neutrons will be generated by 40MeV deuteron beam injection into a high-speed liquid lithium (Li) plane jet, flowing along a vertical concave wall in vacuum. The Li jet has to be stable to produce a stable neutron field, while a free surface flow is anticipated to be unstable. In order to ensure a reliable operation, a detailed knowledge of the Li flow is of conical importance. The experiment on the Li flow is conducted using the Li loop facility to qualify the magnitude of the surface oscillation. The test section of this loop, which is a 1/2.5 scale of the IFMIF design, produces a flat plane jet of 10mm in depth and 70mm in width with a free surface in the velocity range of up to 15m/s. In the present study, a surface-detection apparatus called electro-contact probe, is employed. This apparatus allows us to measure the surface oscillation directly. By means of the electro-contact probe, the magnitude of the surface oscillation in this configuration was found to be in the range from 2.2 to 2.9mm at the position of 175mm downstream from the nozzle exit at a mean velocity of 15m/s. This is the first time it was measured in detail. These values are considered to be improved in the case of the actual target of IFMIF. Estimation shows the present data of 2.9mm could be transformed to be much smaller value, if the flow is free from the effect of surface wakes.