Control of laminar-instability waves using a new technique
Control of laminar-instability waves using a new technique
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使用新技术控制层流不稳定波
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;G. Brown;D. Nosenchuck
提出了一种利用表面膜活化剂通过周期性加热诱导和控制层流不稳定波的新技术。在高铁高速水洞中安装了一个装有表面加热器和探头的平板。观测到极二维自然发生的托尔米恩-施里希廷（TS）波以及随后形成的湍流斑。然后使用表面安装的加热器以受控的方式激发层流不稳定波。对受激层流不稳定波进行了消去的初步实验。最后，利用调幅爆发产生湍流点，形成高斯TS波包。利用流动可视化和壁面剪切测量来推断壁面附近的速度和涡度场。
A new technique using surface-film activators has been developed to induce and control laminar-instability waves by periodic heating. A flat plate was instrumented and installed in the GALCIT High-Speed Water Tunnel with flush-mounted surface heaters and probes. Extremely two-dimensional naturally occurring Tolmien-Schlichting (TS) waves were observed along with the subsequent formation of turbulent spots. Laminar-instability waves were then excited in a controlled fashion using the surface-mounted heaters. A preliminary experiment on cancellation of excited laminar-instability waves was carried out. Finally, turbulent spots were produced using amplitude-modulated bursts to form Gaussian TS wave packets. Flow visualization, along with wall shear measurements, was used to infer the velocity and vorticity field near the wall.