液态金属包层中氚输运特征的数值研究  

Numerical Investigation of Tritium Transport Characteristics in Liquid Metal Blanket

作　　者：黄护林 杨娅 鹿鹏 HUANG Hulin;YANG Ya;LU Peng(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Laboratory of Aerospace Entry,Descent and Landing Technology,Nanjing 211106,China)

机构地区：[1]南京航空航天大学航天学院,南京211106 [2]航天进入与减速实验室,南京211106

出　　处：《工程热物理学报》2023年第1期199-206,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.11675077,No.51876090)。

摘　　要：本文对聚变反应堆双冷锂铅包层(DCLL)的不同入口速度、磁场强度和Ra数下氚的输运特征进行了三维数值模拟。结果表明入口速度越大,射流速度也越强,其有利于氚的输运;因磁场有抑制液态金属流动的作用,随着磁场强度的增加,浮升力引起的混合对流效应被抑制,浮升力对速度分布的影响减小,因此增大磁场强度会抑制通道中心区域氚的输运,但产生的磁流体效应会促进侧层中氚的输运;中子热源的存在使通道内出现涡流,并引起了截面中心线上不对称的“M”型速度分布;Ra数越大,最大射流比和两侧层间的最大速度差均增大,但整体氚输运受到抑制。In this paper, the three-dimensional numerical simulations for tritium transport characteristics in Dual-cooled Lithium-Lead(DCLL) blanket of fusion reactor under different inlet velocities, magnetic field strengths and Ra numbers were carried out. The results show that the higher the inlet velocity is, the stronger the jet velocity is, which is beneficial to tritium transport. With the increase of magnetic field intensity, the mixed convection caused by buoyancy effect is suppressed,then the influence of buoyancy convection on velocity distribution is declined because the magnetic field can inhibit the liquid metal flow. Therefore, increasing the magnetic field intensity will reduce the transport of tritium in the central of the channel, but promote the transport of tritium in the two side layers. The existence of a neutron heat source makes eddy currents appear in the channel,which causes the “M” shape velocity distribution to become asymmetric along the center line of the cross section. The increment of maximum velocity difference between the two side layers for larger Ra number enhances the jet ratio, which reduces the tritium transport rate.

关 键 词：双冷锂铅包层 磁流体动力学 氚输运 混合对流 氚浓度 

分 类 号：O359.1[理学—流体力学]