中文摘要：

阐述了磁流体动力学（MHD）控制流场作用机理。在小磁雷诺数条件下，运用数值模拟方法，对不同外加电磁场条件下三维MHD管道流动的流场情况进行研究，得出不同磁场、电场等MHD参数作用下MHD加速器的性能。对MHD加速器的应用前景进行了展望。计算结果显示，电场取6000V／m。磁场为0．92T情况下，流场的加速性能可达13．46％，并且可以通过减小磁场或增大电场进一步提高加速性能；在仅添加0．92T磁场条件下，速度减速可达16．35％。

英文摘要：

The mechanism of magnetohydrodynamic（MHD） control is demonstrated in the article. Based on small magnetic Reynolds number assumption,the performance of MHD accelerator under various MHD parameters as magnetic field and electric field is concluded by numerical simulation of flow field added with various electric and magnetic field conditions in 3D MHD channel. The prospect of the MHD accelerator is evaluated in the article. Result shows： with 6000V/m electric field and 0.92T magnetic field added, the outlet velocity is accelerated by 13.46%, and it is decelerated by 16.35% when 0.92T magnetic field added.