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Electromagnetic coupling phenomena in co-axial rectangular channels
Fusion Engineering and Design ( IF 1.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.fusengdes.2020.111854
Simone Siriano , Alessandro Tassone , Gianfranco Caruso , Alessandro Del Nevo

Abstract In the Water-Cooled Lithium Lead (WCLL) blanket, the eutectic alloy lithium-lead (PbLi) is used as tritium breeder and carrier, neutron multiplier and heat transfer medium. The liquid metal is distributed to and collected from the breeding zone through a compact poloidal manifold composed of two co-axial rectangular channels. The external channel, tasked with distribution, and the internal one, assigned to the collection, are co-flowing and share an electrically conductive wall ( c w = 0.1 ). The liquid metal, interacting with the reactor magnetic field, leads to the arising of MagnetoHydroDynamic (MHD) effects that are expected to significantly modify the flow feature and electrically couple the external and internal channels. In this work, the general-purpose CFD code Ansys CFX 18.2 is used to study the coupling phenomena in a wide range of magnetic fields (up to H a = 2000 ) for a prototypical square co-axial channel. Characteristic flow features and their evolution with increasing magnetic field and varying mass flow rate between the channels are discussed and compared with the uncoupled case, which is in turn composed by a rectangular electro-conductive annulus (external) and a square electro-conductive duct (internal). A correlation is found linking the pressure loss in the studied configuration and an equivalent square channel through a corrective factor e, which exhibits an asymptotic behavior for H a > 1000 .

中文翻译:

同轴矩形通道中的电磁耦合现象

摘要 在水冷铅铅(WCLL)毯中,共晶合金锂铅(PbLi)用作氚增殖剂和载体、中子倍增器和传热介质。液态金属通过由两个同轴矩形通道组成的紧凑极向流形分布到繁殖区并从繁殖区收集。负责分配的外部通道和分配给集合的内部通道共同流动并共享一个导电壁( cw = 0.1 )。液态金属与反应堆磁场相互作用,导致磁流体动力学 (MHD) 效应的出现,预计这些效应将显着改变流动特征并电气耦合外部和内部通道。在这项工作中,通用 CFD 代码 Ansys CFX 18。图 2 用于研究原型方形同轴通道在大范围磁场(高达 H a = 2000 )中的耦合现象。讨论了特征流动特征及其随着磁场增加和通道之间质量流量变化的演变,并与非耦合情况进行了比较,后者依次由矩形导电环(外部)和方形导电管道(内部的)。发现通过校正因子 e 将所研究配置中的压力损失与等效方形通道联系起来的相关性,其在 H a > 1000 时表现出渐近行为。讨论了特征流动特征及其随着磁场增加和通道之间质量流量变化的演变,并与非耦合情况进行了比较,后者依次由矩形导电环(外部)和方形导电管道(内部的)。发现通过校正因子 e 将所研究配置中的压力损失与等效方形通道联系起来的相关性,其在 H a > 1000 时表现出渐近行为。讨论了特征流动特征及其随着磁场增加和通道之间质量流量变化的演变,并与非耦合情况进行了比较,后者依次由矩形导电环(外部)和方形导电管道(内部的)。发现通过校正因子 e 将所研究配置中的压力损失与等效方形通道联系起来的相关性,其在 H a > 1000 时表现出渐近行为。
更新日期:2020-11-01
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