高超声速等截面磁流体发电机性能研究

Performance investigation of hypersonic rectangular MHD generator

采用三维低磁雷诺数磁流体动力学五方程模型,对等截面管道法拉第型分段电极磁流体发电机内的流动进行数值模拟,研究了负载系数、磁场强度、电极-绝缘壁宽度比对发电通道性能的影响.结果表明:当负载系数为0.50时电功率密度达到最大,并且随着负载系数的增大发生器的减速能力降低;当磁场强度为8T时,500mm的管道长度即可将来流马赫数从6降低到3以下,温度保持在800K以下,并且每立方米的管道发电量能够达到兆瓦级的水平.

Three dimensional magnetohydrodynamics（MHD） five-equation model associated with low magnetic Reynolds assumption was used to simulate the flow phenomenon for a rectangular Faraday type MHD generator with segmented electrode,and the effects of load factors,intensity of magnetic field and the width of the electrodes on the performance of the generator were investigated.The results show that,the electrical power density reached its maximum value when the loading factor is 0.50,and with the increase of the load factor,the slowing capacity of the generator is reduced.At the magnetic field strength of 8 T,the 500 mm long generator can reduce the Mach number from 6 to 3 below,the temperature could be kept below 800 K,and power generation can reach the amount of megawatt-scale of per cubic meter of the duct.