Active control of laminar-turbulent transition
Active control of laminar-turbulent transition
复制标题
层流-湍流转变的主动控制
DOI：
--
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发表时间：
1982
影响因子：
3.7
通讯作者：
D. Nosenchuck
中科院分区：
文献类型：
--
作者：
H. Liepmann;D. Nosenchuck
不稳定波，通常称为T-S波，可以通过平装加热元件的周期性加热在层流边界层中引入。实验证明，用第二个相移合适的下游加热元件，可以几乎完全消除以这种方式激发的T-S波。作为该技术的一种应用，单个单元和由测量的壁面剪应力激活的反馈回路一起被用来减小自然产生的层流不稳定波的幅度。转变雷诺数有了显著的提高。
Instability waves, commonly called T-S waves, can be introduced in a laminar boundary layer by periodic heating of flush-mounted heating elements. Experiments have demonstrated that nearly complete cancellation of a T-S wave excited in this way can be achieved by using a second downstream heating element with a suitable phase shift. As one application of the technique, a single element together with a feedback loop activated by measured wall shear stress has been used to reduce the amplitude of naturally occurring laminar instability waves. A significant increase in the transition Reynolds number has been achieved.