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本文根据二维可压非定常Ｎ－Ｓ方程，用基于ＢｅａｍａｎｄＷａｒｍｉｎｇ及Ｓｔｅ－ｇｅｒ的方法，在圆柱绕流出现周期性分离后，施加吸气条件，研究吸气对于圆柱非定常绕流的影响。计算结果表明，在恰当的区域施加恰当的吸气条件，可以希望通过减小压差阻力来减小总阻力，吸气还有抑制尾迹中非对称流动的作用，从而使圆柱所受的垂直于来流方向的升力的变化幅度减小，变化频率减小。但是吸气会增加摩擦阻力，过份的吸气会导致摩阻增长太多，从而使得圆柱的总阻力不会减小反而增加。
In this paper, based on the two-dimensional compressible unsteady N-S equations, a BeamandWarming and Ste-ger method is used to study the effect of suction on the unsteady flow around the cylinder after the periodic separation of the flow around the cylinder. The results show that the appropriate area in the appropriate suction conditions, you can hope that by reducing the pressure drop drag to reduce the total resistance, inspiratory also inhibit the wake of the asymmetric flow, so that the cylinder suffered perpendicular to the The magnitude of the change in the lift of the incoming stream decreases and the frequency of change decreases. However, inhalation will increase the frictional resistance, excessive inhalation will lead to friction growth too much, so that the cylinder will not reduce the total resistance but increased.