液态金属磁流体发电机空载电压  

No-load voltage of liquid metal magnetohydrodynamic power generator

作　　者：易仁义 王勇[1] 谢玉东 乔凯 张宇磊 YI Ren-yi;WANG Yong;XIE Yu-dong;QIAO Kai;ZHANG Yu-lei(School of Mechanical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学机械工程学院,山东济南250061

出　　处：《浙江大学学报（工学版）》2020年第10期1964-1970,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51875316);山东省自然科学基金资助项目(ZR2019MEE025)。

摘　　要：为了探究影响液态金属磁流体发电机空载电压的因素,建立发电通道三维流动模型.采用计算流体力学(CFD)技术,研究发电通道入口速度、磁感应强度、通道宽度、通道高度、液态金属类别对空载电压的影响.考虑哈特曼层电流回流现象,通过添加绝缘块,对发电通道装置进行结构改进.从改进后的磁流体速度分布和电流密度变化两方面,分析空载电压优化机理.结果表明:空载电压与入口速度、磁感应强度、通道宽度成正比,与通道高度无明显关系,但是通道宽度越大,空载电压相对误差越高;高密度、低电导率的液态金属会降低空载电压.发电通道改进前,空载电压的相对误差为12.3%;改进后的发电通道,空载电压比改进前提高13.3%,相对误差降至0.6%.A three-dimensional flow model of power generation channel was constructed in order to analyze the factors affecting the no-load voltage of liquid metal magnetohydrodynamic power generator.The influence of inlet velocity,magnetic flux density,channel width,channel height and liquid metal category on no-load voltage was analyzed based on computational fluid dynamics(CFD)method.The structure of power generation channel was modified by adding insulating blocks considering that current has reflux phenomenon in Hartmann layer.The optimization mechanism of the no-load voltage was analyzed from two aspects of the change of velocity distribution and current density.Results showed that the no-load voltage was proportional to the inlet velocity,magnetic flux density and channel width,but had no obvious relationship with channel height.The larger the channel width was,the higher the relative error of the no-load voltage was.The liquid metal with high density and low conductivity reduced the no-load voltage.The relative error of no-load voltage was about 12.3%before the improvement of generation channel.After the improvement,the no-load voltage was increased by 13.3%and the relative error was reduced to 0.6%compared with before improvement.

关 键 词：液态金属磁流体(LMMHD) 空载电压 结构改进 FLUENT 

分 类 号：TK5[动力工程及工程热物理—热能工程]