【摘要】 为获得新型液态金属磁流体发电机的流动规律,对空载发电通道动力学特性进行三维数值模拟研究。采用基于Fluent软件的感应磁场法和修正的K-ε湍流模型保证计算精度;对比分析近壁面和中心层的速度及电磁力分布;定义速度波动程度,选取不同物理参数,对发电有效段下游的速度剖面及其波动程度量化分析。结果表明,发电有效段下游速度波动程度最大,速度剖面及其波动程度受发电通道参数的影响明显。当通道宽度相同时,相互作用参数决定速度剖面波动程度,相互作用参数与速度波动程度成正比;随着宽度增大,相互作用参数对速度波动程度影响下降。更多还原

【Abstract】 In order to get the flowing law in a liquid metal magnetohydrodynamics(MHD) generator channel,three-dimensional numerical studies on kinetics characteristics of open circuit generators were carried out.A magnetic induction method and a modified K-ε turbulence model based on Fluent were adopted to ensure the calculation precision.A comparative analysis of the velocity and force distribution of near-wall and core was made.The velocity fluctuation was defined and different physical parameters were chosen.The velocity profiles and fluctuations downstream of the effective section were analyzed quantitatively.The results showed that,the velocity fluctuations reached maximum at downstream of the effective section and channel parameters had a significant impact on velocity profiles.The channel width being kept constant,the interaction parameter determined the velocity fluctuation and the velocity fluctuation was proportional to the interaction parameter.As channel width increased,the impact of interaction parameters on velocity fluctuations declined.更多还原