为抑制圆柱绕流时受到的涡激力、保护圆柱结构安全，通过施加边界层吸气控制圆柱在涡激效应下受到的周期力。采用数值模拟方法分析Re=200时吸气口位置和吸气强度对圆柱受力情况及尾涡脱落结构的影响。结果表明：当吸气口布置在60°、90°和120°位置时，添加吸气条件会显著减小圆柱受到的涡激力；吸气条件的引入对圆柱尾涡的脱落规律有显著的影响，相比较而言，吸气口位置对尾涡脱落结构的影响大于吸气强度；在圆柱受到的涡激力显著减小的情况下，圆柱尾部脱落的尾涡结构较之前有明显变化，由交替脱落的、方向相反的对涡变为不再脱落的、狭长的涡结构。

In order to suppress the vortex force imposed on the cylinder and protect the structure of the cylinder,the unsteady separated flow around a cylinder was simulated numerically with boundary layer suction at Re=200.We focus on the influence of suction slot position and suction intensity on the force of cylinder and the structure of wake vortex shedding from cylinder.The results shows that the total drag and lift coefficient of cylinder can be decreased under the suction slot position set at 60°,90° and 120°.The introduction of boundary layer suction has a significant effect on the shedding law of the cylindrical wake.The effect of the suction slot position on the vortex shedding structure is greater than that of the suction intensity.At those positions,the structure of the trailing vortex of the cylindrical tail has changed significantly,from the opposite vortex that alternates the direction of shedding into a long,narrow vortex structure that no longer sheds.

TU973.32

国家自然科学基金(52036005)