用主动柔顺壁运动控制边界层转捩

应用主动柔顺壁运动抑制平板边界层内扰动的增长和推迟边界层转捩的实验研究结果表明，边界转捩过程中的扰动即使已发展到非线性阶段，也能被主动柔顺壁的运动所控制。通过控制柔顺壁下方空腔内的输入声激励强度所产生的控制扰动，可以明显地抑制边界层内扰动的非线性增长率和推迟边界层转捩过程。改变控制扰动与初始扰动间的相位差，对于二维初始扰动，可以明显地提前和推迟边界层转捩过程，但对三维初始扰动，发迹相位差对边界层转

Control of Boundary Layer Transition Using Active Compliant Wall Motion

A preliminary experimental investigation was carried out at the low turbulence wind tunnel in Nanjing University of Aeronautics and Astronautics for the control of boundary layer transition using an active compliant wall motion.The experimental results indicate that the disturbance in transitional boundary layers can be controlled by the forced motion of the compliant surface,even if the initial disturbance is already non linear.Transition enhancement and substantial delay can be realized with different phase shift between the control disturbance and two dimensional initial disturbance.However,the effect of the phase shift on boundary layer transition for three dimensional initial disturbance is much weaker.