圆柱表面包覆电磁场消涡与增涡实验研究

利用电磁体积力改变流体边界层的结构，用作用于流体边界层上的电磁力进行消涡与增涡控制。交替分布的电极和磁极包覆在圆柱体的表面置于电介质溶液中，简单调整电磁力的时间与空间分布可以方便地控制圆柱绕流的形态。通过理论分析和数值模拟确定了实验控制的关键参数，实现了电磁力消涡和增涡的连续控制，电磁力作用下的圆柱绕流的分离点可以在前驻点和后驻点之间变动。

Experiments on Vortex Suppression and Vortex Acceleration by Means of Electromagnetic Field Localized on the Cylinder Surface

The electromagnetic body force was used to change the configuration of the boundary layer of flow. It was conducted that the suitable magnetic and electric fields localized on the cylinder surface controlled the vortex suppression and the vortex acceleration about the topic of the flow around the circular-cylinder. The key parameters of the experimental controlling have been confirmed by theoretical analysis and numerical simulation. The electrodes and the permanents are flush mounted on the cylinder surface side by side in the order of magnet N-pole, positive electrode, magnet S-pole, negative electrode, and so on. It is convenient to control the flow structure around the circular cylinder surface by means of adjusting the distribution of the electromagnetic body forces, and it is achieved continually the vortex suppression and the vortex acceleration. The separation points of the circular-cylinder flow maybe changed between the front stay point and the back stay point according to the varieties of the space-time distribution parameters of the electromagnetic body forces, and it brings different control effects.