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作 者:吕浩宇[1] 李椿萱[1] 董海涛[1] 陈刚[1]
机构地区:[1]北京航空航天大学航空科学与工程学院,北京100083
出 处:《力学学报》2008年第3期306-314,共9页Chinese Journal of Theoretical and Applied Mechanics
摘 要:应用三维非理想低磁雷诺数磁流体五方程模型发展了对带有强制项的Navier-Stokes方程组采用熵条件格式,对椭圆型电势方程采用SOR进行迭代的数值方法,研究了Hall效应对磁流体旁路超燃冲压发动机中磁流体发生器流动及性能的影响.磁流体发生器采用电子束获得有效可靠的电导率.计算结果表明,Hall效应可引起流场和电场的扭曲,从而诱导出不稳定二次流的发展与演变,并破坏Joule热的分布.对这些磁流体现象作出了较详细的分析.最后计算了磁流体发生器的性能参数,说明Hall效应将导致磁流体发生器的性能下降.A numerical procedure for analyzing the MHD flows in the MHD generator of the bypass scramjet engine was developed in the present study by applying a five-equation model associated with non-ideal MHD flows at low magnetic Reynolds number. In the numerical procedure, an entropy condition scheme was applied for solving the non-homogeneous Navier-Stokes equations and an SOR method for solving the elliptic equation governed the electrical potential. The Hall effects on the MHD flow in the MHD generator were studied numerically. E-beams were shown as the ionizer to provide the effective and stable conductivity in the MHD flows. The numerical results indicated that the Hall effects might make the distortions on the flow and electric fields in the MHD generator to induce unstable secondary flow, and non-uniform Joule heating. In addition, The performance parameters of the MHD generator were obtained numerically to reveal that the Hall effects may deteriorate the performance of MHD generator.
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