磁流体压缩管道热电磁流动特性研究  

Numerical study on performances and characteristics of magnetohydrodynamic converging channel

作　　者：吕浩宇[1] 

机构地区：[1]北京航空航天大学宇航学院,北京100191

出　　处：《计算力学学报》2011年第5期773-778,共6页Chinese Journal of Computational Mechanics

摘　　要：利用磁流体五波模型对低磁雷诺数下压缩管道中磁流体流动进行数值模拟。该模型由带有电磁作用强制项的Navier-Stokes方程组与电势Poisson方程组成,数值格式分别采用严格保证熵条件的熵条件格式和中心差分格式。数值模拟对不同磁作用数下的不同几何外形管道进行数值模拟研究,结果表明在磁流体压缩管道中,由于发生器模式提取能量的影响,使得管道马赫数和总焓均下降,而流动在电极壁面上发生了分离。在中心流动区域,随着磁作用数的增大而产生严重的涡电流。计算比较了磁流体压缩发生器与直方管道型发生器的性能参数,说明直方管道的性能优于压缩管道。Numerical simulations were conducted to study magneto-hydrodynamic（MHD） flow in a converging channel at low magnetic Reynolds number by a numerical procedure composed of an entropy conditioned scheme for solving the non-homogeneous Navier-Stokes equations, in conjunction with an SOR method for solving the elliptic equation governing the electrical potential. Two kinds of channels with dissimilar geometry at different magnetic interaction parameter were investigated. It was found in the MHD converging channel, a separation would take place near the inlet of the channel on the electrode walls. The electric current lines would be increasingly distorted as the magnetic interactive parameter increased. Numerical results and comparisons indicated that the performance of the MHD channel with same cross-sections is better that the converging channel.

关 键 词：磁流体旁路超燃冲压发动机 磁流体发生器 压缩管道 数值模拟 熵条件格式 

分 类 号：O361.3[理学—流体力学]