通过数值求解Navier Stokes方程 ,研究了无限翼展直后掠翼在不同后掠角下的大迎角粘性分离流 ,探讨了后掠角对流场结构和升阻力特性的影响。基于对流动特性的机理分析 ,文中进一步数值模拟了无限展长后掠翼带表面吹吸气的大迎角绕流 ,研究了以非定常质量引射作为外激发手段对后掠翼前缘涡形成、发展和脱泻 ,以及对提高机翼升力特性的影响 The Navier Stokes equation is solved numerically to study the viscous separation flux at high angle of attack of swept wing with different swept angles. The effects of sweep angle on the structure of flow field and the characteristic of lift resistance are discussed. Based on the mechanism analysis of the flow characteristics, the numerical simulation of the flow around the inflow at high angle of attack on the infinitely extended swept-back wing is carried out. The effects of unsteady mass ejection on the front vortex Formation, development and diarrhea, as well as the impact on improving wing lift characteristics