Studies on the stabilization of high-speed surface flow of liquid metal lithium by magnetic field

磁场稳定液态金属锂高速表面流动的研究

• 批准号: 13480135
• 负责人: HORIIKE Hiroshi
• 金额: $ 9.28万
• 依托单位: OSAKA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13480135/
• 关键词: IFMIF; liquid metal lithium; free surface flow; external magnetic field; turbulent suppression; stability; 磁場による安定化

This study was planned on the lines of the experimental study of the free-surface lithium flow for the IFMIF (International Fusion Material Irradiation Facility) target, held from the year 2000, and treating the stabilization of the flow due to external force such as magnetic field, which was not included in the scope of the IFMIF R&D. In the IFMIF design, the flow is stabilized by centrifugal force. It is, however, worthwhile to have an option for future desing by studying the stabilization with simple magnetic field because the turbulent suppression effect of magnetic field is signficant.An air-core coil to apply magnetic field was designed for the lithium free-surface test loop, and power supplies were equipped with the coil. Some instruments were installed to verify the stability of the flow. An ultrasonic transmitter was prepared under the flow channel to investigate the stability by sounding echoes from the surface. Mechanical and laser wavefront meters were mounted above the channel. Stabilization effect of magnetic field was evaluated and the requirement for the magnetic field was estimated as well.Experiments were done according to these evaluation, the free-surface flow of 13.6m/s at maximum was achieved under argon atmosphere. It was also achieved to generate stable flow of 8.5m/s at 0.029MPa, and 4.3m/s at vacuum. The wavefront was cofirmed to be stable by visual observation. THe perturbation of the wavefront was also recorded into a high-speed video camera. As the result of analyzing the video image, it was found that the wave-number spectrum was almost randon and no anomalous frequency was observed, that is, any particular instability was recognized. From the analysis, it was also found that the speed of surface wave was able to calculate from the cross correlation of the wave.It is concluded that the results are satisfactory and will contribute to the R&D of IFMIF.

本研究是按照2000年开始的IFMIF（国际聚变材料辐照装置）靶的自由表面锂流动的实验研究，研究IFMIF研究开发范围以外的磁场等外力作用下的流动稳定化。在IFMIF设计中，通过离心力稳定流动。但由于磁场对湍流的抑制作用很大，因此，研究简单磁场的稳定性对今后的设计有一定的参考价值。设计了一个空心线圈来施加磁场，并为锂自由表面试验回路配备了电源。安装了一些仪器来验证流量的稳定性。超声波发射器下的流动通道，调查的稳定性，从表面探测回波。机械和激光波前计安装在通道上方。对磁场的稳定效果进行了评价，估算了磁场的要求，并根据评价结果进行了实验，在氩气保护下，获得了13.6m/s的最大自由表面流场。在0.029MPa压力下，获得了8.5m/s的稳定流动，在真空下获得了4.3m/s的稳定流动。通过目测确认波前稳定。波前的扰动也被记录到高速摄像机中。通过对视频图像的分析，发现波数谱几乎是随机的，没有观察到异常频率，也就是说，识别出任何特定的不稳定性。通过分析还发现，可以利用面波的互相关特性计算面波的传播速度，结果令人满意，为IFMIF的研制提供了参考。

项目成果

Uda N, Miyazawa A, Inoue S, et al.: "Forced convection heat transfer and temperature fluctuations of lithium under transverse magnetic fields"Journal of Nuclear Science and Technology. 38(11). 936-943 (2001)

Uda N，Miyazawa A，Inoue S，等：“横向磁场下锂的强制对流传热和温度波动”核科学与技术杂志。

Uda N, Miyazawa A, Inoue S, et al.: "Forced convection heat transfer and temperature fluctuations of lithium under transverse magnetic fields"Jurnal of Nuclear Science and Technology,. Vol. 38, No. 11. 936-943 (2002)

Uda N，Miyazawa A，Inoue S，等：“横向磁场下锂的强制对流传热和温度波动”核科学与技术杂志，。

H.Nakamura, B.Riccardi, K.Ara, L.Burgazzi, H.Horiike 他: "Latest Liquid Lithium Target Design During the Key Element Technology Phase in the International Fusion Materials Irradiation Facility (IFMIF)"Fusion Engineering and Design. (発表予定). (2003)

H. Nakamura、B. Riccardi、K. Ara、L. Burgazzi、H. Horiike 等人：“国际聚变材料辐照设施 (IFMIF) 关键元件技术阶段的最新液态锂靶材设计”聚变工程与设计（2003）

Uda N, Yamaoka N, Horiike H, et al.: "Heat transfer enhancement in lithium annular flow under transverse magnetic field"Energy Conversions and Managements. 43(3). 441-447 (2001)

Uda N、Yamaoka N、Horiike H 等人：“横向磁场下锂环形流的传热增强”能量转换与管理。

Nkamura H, Burgazzi L, Cevolani S,et al.: "Status of activities on the lithium target in the key element technology phase in IFMIF"Jurnal of Nuclear Materirals,. Vol 307-311. 1675-1679 (2002)

Nkamura H、Burgazzi L、Cevolani S 等人：“IFMIF 关键元素技术阶段锂靶材活动的现状”核材料杂志，。