液态金属磁流体发电机性能分析  

Performance analysis of liquid metal magnetohydrodynamics power generator

作　　者：易仁义 王勇[1] 谢玉东 YI Renyi;WANG Yong;XIE Yudong(School of Mechanical Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]山东大学机械工程学院,山东济南250061

出　　处：《山东大学学报（工学版）》2021年第6期34-40,共7页Journal of Shandong 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：为探究液态金属磁流体发电机性能,基于计算流体力学技术对发电通道进行三维数值模拟分析。采用改进的湍流模型提高计算精度,通过空载情况下获得的空载电压计算负载电压,定义实际输出功率;分析不同负载系数下发电通道内部电流密度分布;探究通道入口速度、磁感应强度、负载系数对发电机性能的影响。结果表明:输入功率随着负载系数的增大而减小,存在最优负载系数使得输出功率和发电机效率最大;入口速度和磁感应强度增大,输入功率和输出功率均提高,然而入口速度增大会降低发电机效率,磁感应强度的增大对提高发电效率有正面作用,但是当磁感应强度增大到一定程度,磁场对效率的提高作用不再明显。为使发电机性能最优应尽量增大外加磁感应强度,保持入口速度适中,且选择负载系数为0.5—0.6。In order to explore the performance of the liquid metal magnetohydrodynamics(MHD)power generator,three-dimensional numerical simulation analysis of the power generation channel was carried out based on the computational fluid dynamics method.A modified turbulence model was adopted to improve the calculation accuracy.The load voltage was calculated by the no-load voltage obtained under no-load condition,and the actual output power was defined.Meanwhile,internal current density distribution of the power generation channel under different load factors was analyzed.Moreover,the influence of inlet velocity,magnetic flux density and load factor on generator performance was explored.Results showed that the input power decreased with the increase of load factor,but there was an optimal load factor to maximize the output power and power generation efficiency.The input power and output power increased with the increase of inlet velocity and magnetic flux density.However,the increase of inlet velocity reduced the power generation efficiency.The increase of magnetic flux density had a positive effect on the improvement of the power generation efficiency.But this effect was no longer obvious when the magnetic flux density increased to a certain extent.In order to obtain the optimal performance of the generator,the magnetic flux density should be increased as much as possible,the inlet velocity should be kept moderate,and the load factor need to be selected as 0.5—0.6.

关 键 词：液态金属磁流体 数值模拟 电流密度 负载系数 发电机性能 

分 类 号：TM916.5[电气工程—电力电子与电力传动]