摘要：The influence of Multi-field coupling on EMHD (electromagnetic hydrodynamics) propulsion by surface has been numerically investigated in this paper. In former studies, induced item in Lorentz force is usually ignored due to low Reynolds number or weakly conductive fluid. However, for some special environments, this influence of induced item cannot be ignored anymore. Based on navigation model, numerical simulation of EMHD propulsion by surface at Reynolds number 104 are carried out to examine the influence of propulsion effect and flow field characteristic by different magnetic. This result shows that, within a certain range, the efficiency improved with magnetic field intensity, however with its further increase the efficiency decreases, which depends not only on magnetic but also on Reynolds number. Moreover, instead of machine driven, this propulsion scheme offers several advantages over the conventional locked train gear drives, such as noise reducing, less space requirement and so on. This article further explores some of the basic principles of EMHD propulsion and provides a methodology for evaluating the performance of such systems.
