Laminar Streaks in Oscillating Boundary Layers

Laminar Streaks in Oscillating Boundary Layers
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振荡边界层中的层流条纹

DOI:
10.1016/j.piutam.2015.03.049
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发表时间:
2015
期刊:
Procedia IUTAM
影响因子:
--
通讯作者:
Hicks P
Hicks P
中科院分区:
--
文献类型:
--
作者:
Hicks P

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在存在展向壁振荡和稳定的流向相关展向壁力的情况下,研究了平板边界层中层流条纹的生长。层流条纹受到自由流涡旋扰动的影响,自由流涡旋扰动与边界层相互作用产生扰动,扰动首先增大,然后衰减。振荡板产生的基流与流向和壁法线方向上的 Blasius 边界层相匹配,但在翼展方向上产生广义斯托克斯层 (GSL)。这取决于 Blasius 流,并在高振荡频率或大下游距离的渐近极限下趋向于经典斯托克斯层 (CSL)。板的翼展方向振荡和翼展方向的壁力都可以降低扰动的总能量和最大幅度。讨论了它们的相对影响。
The growth of laminar streaks in a flat-plate boundary layer is investigated in the presence of both spanwise wall oscillations and steady streamwise-dependent spanwise wall forcing. The laminar streaks are forced by free-stream vortical disturbances, which interact with the boundary layer to produce disturbances, which first grow and then decay. The oscillating plate produces a base flow that matches Blasius boundary layer in the streamwise and wall-normal directions, but produces a generalized Stokes layer (GSL) in the spanwise direction. This depends on the Blasius flow and tends to the classical Stokes layer (CSL) in the asymptotic limit of high oscillation frequency or large downstream distance. Spanwise oscillations of the plate and spanwise wall forcing can both reduce the total energy and maximum amplitude of the disturbances. Their relative effects are discussed.
小波长自由流涡引起的过渡前克莱巴诺夫模式和其他边界层扰动
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