【摘要】 利用作用于流体边界层上的电磁体积力改变流体边界层的结构,研究电磁力对流场的控制作用效果,电极与磁极交替分布的电磁场激活板包覆在圆柱体表面置于流动的电解质溶液中,产生的电磁力沿圆柱体表面分布,可以改变流体边界层的结构,从而实现对流场的控制,用电磁屏蔽和时域控制的方法调整电磁力的时空分布参数,圆柱绕流分离点可以在前驻点和后驻点之间变动,产生不同的控制效果,流体边界层上的电磁力能连续控制圆柱绕流、尾流涡街的形态,正向电磁力具有较好的消涡、减震和减阻控制效应,反向电磁力具有明显的增涡控制效应,具有较强的制动控制效应,此时圆柱体表面涡量分布的对称性和稳定性被破坏。更多还原

【Abstract】 The controlling effects of flow caused by electromagnetic body forces have been conducted. The key parameters of control experiments have been confirmed by the theoretical analysis and the numerical simulation. The electrodes and the magnetic poles are flush mounted on the cylinder surface side by side in the order of magnet N-pole, positive(negative) electrode, magnet S-pole, negative(positive) electrode, and so on. The cylinder covered with electro-magnetic actuator is immerged in the flowing electrolyte solution. The electromagnetic body forces, which localized on the circular cylinder surface, have been used to modify the boundary layer of flow and control the flow flied structure. By means of the electro-magnetic shielding and the time-region control methods, the separation points of the circular-cylinder flow are moving between the front stay point and the back stay point as the varieties of the space-time distribution parameters of the electromagnetic forces, and it brings different control effects. The electromagnetic force modified on the boundary layer is convenient to controlling the flow flied structure of the circular-cylinder flow and the cylinder wake, and it is achieved the obvious effects of the vortex suppression and the vortex acceleration. There are provided with the preferable effects of the oscillation absorption and the drag reduce while the positive electromagnetic forces processed. There are existed very strong effects of damping control while the negative electromagnetic forces processed, at that time the characteristics of symmetry and stability of the vorticity distribution on the cylinder surface are destroyed.更多还原