离体射流对S809翼型气动性能的影响

在Re=5×106的条件下,分别在S809翼型前缘点附近不同位置处设置离体射流装置,改变射流动量的大小和射流口宽度,探究其对S809翼型气动性能的影响.并通过流场分析,研究这种流动控制手段有效的物理机理.结果表明:在射流装置位置和射流口宽度固定时,射流动量的大小对控制效果影响显著;在S809翼型表面附近设置微小离体射流...

Flow Control of the Stalled S809 Airfoil With the Separated Jet Flow Device

The flow control effect of a separated jet flow device set around the S809 airfoil suction surface at Re=5×10⁶ was discussed by numerical simulation.The momentum coefficient of jet flow,the length of jet-port and initial position of the separated jet flow device are three main parameters to be considered in this paper.A physical analysis of the flow fields is performed to illustrate the mechanisms of flow control for the improvement of airfoil aerodynamic performance.Numerical results suggest that:when the length of jet-port and initial position of the separated jet flow device were fixed,the momentum coefficient of jet flow has a significant impact on control effect:after the separated jet flow device set around the S809 airfoil suction surface,a small control effect can be achieved even the momentum coefficient of jet flow was set as zero;bigger momentum coefficient of jet flow corresponds to smaller scale of separation bubble,lower drag coefficient,higher lift coefficient and higher lift-to-drag ratio when the length of jet-port and initial position of the separated jet flow device were fixed.It is worth noting that the length of jetport and initial position of the separated jet flow device also have a significant impact on control effect.