Surface wave on high speed liquid lithium flow for IFMIF
Surface wave on high speed liquid lithium flow for IFMIF
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IFMIF 高速液态锂流的表面波
DOI：
10.1016/j.fusengdes.2005.06.086
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
H. Horiike
中科院分区：
文献类型：
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作者：
H. Kondo;A. Fujisato;N. Yamaoka;Inoue Shigeru;S. Miyamoto;T. Iida;H. Nakamura;M. Ida;I. Matushita;T. Muroga;H. Horiike
自由表面液态金属流动的实验研究是国际聚变材料辐照设施（IFMIF）等强中子源设计的重要问题之一。为了进行高速流动实验，对大阪大学的锂循环装置进行了改造。在本研究中，当速度大于15m/s时，射流自由表面被记录为照片。观测到二维表面波，其速度范围为5 ~ 8m/s。波长约为1 ~ 1.5mm，随速度的增加而减小。与水的实验结果对比表明，锂中的波长比水的波长长约30%。用无量纲波数形式的自由剪切层线性不稳定理论对测量波长进行了比较，结果表明，在大多数不稳定波数和中性稳定韦伯数上，两者是一致的。在速度大于9m/s的区域，自由表面波不表现出周期性结构，可能是由于在喷嘴内过渡为湍流。
Experimental study on free surface liquid metal flow is one of the most important issues for the design of intense neutron source like International Fusion Materials Irradiation Facility (IFMIF). The lithium loop facility in Osaka University was modified to conduct such high speed flow experiment. In this study, the jet flow free surface was recorded as a photo for a velocity of more than 15m/s. Two-dimensional surface waves were observed, and these appeared in the velocity range of from 5 to 8m/s. The wavelength was approximately 1–1.5mm and it decreased with increasing the velocity. Comparison with water experimental results shows that wavelength in lithium is approximately 30% longer than that in the case of water. The measured wavelength was also compared with free shear layer linear instability theory in the form of non-dimensional wavenumber, and these were found to agree, with respect to most unstable wavenumber and neutral stable Weber number. In the velocity region of more than 9m/s, free surface waves are found to show no periodic structure, probably because of transition into turbulent flow in the nozzle.