背负式S形进气道流场控制技术

通过在已有的S形进气道入口第一弯底部布置一系列类机翼的导流叶片,来改善出口流场分布,抑制旋流,减小出口畸变指数.分析了导流叶片的高度、弦长、攻角和安装位置(轴向位置和横向位置)这几个参数对S形进气道内流的影响,并利用计算流体力学(CFD)方法针对导流叶片的组数展开研究,得到最优结果.结果表明,采用优化后的导流叶片,可以有效抑制内流分离,降低S形进气道出口畸变指数,改善流场品质. 这些分析结果对于涡流发生器的设计有一定的指导意义.

Improving dorsal S-shaped inlet performance by vortex flow control

In order to effectively reduce flow distortion produced in the S-shaped inlet,a computational fluid dynamics(CFD) procedure was used to design vortex generator installations near the entry of the diffuser.Several parameters,i.e.the ratio of generator blade height to local boundary layer thickness,the locating position,angle against the centerline,that characterize the vortex generator array were discussed to determine their effects.Especially the numbers of blades were varied to minimize total pressure dist...