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首页> 外文期刊>Aerospace science and technology >Active boundary layer tripping using oscillatory vorticity generator
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Active boundary layer tripping using oscillatory vorticity generator

机译：使用振荡涡旋发生器的有源边界层跳闸

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摘要

The evolution of a train of vortex pairs ejected from a zero-net-mass-flux excitation slot into a Blasius boundary layer was studied experimentally, with the aim of active boundary layer tripping. The excitation was directed upstream or downstream, at a shallow angle, or perpendicular to the surface. Vorticity, circulation, trajectories and convection speeds were calculated and used to describe the vortices' evolution. Intermittency, spectra and mean velocity profiles of the forced boundary layer were measured, in addition to the PIV data. It was found that periodic excitation is very effective for promoting sub-critical transition. More effective, abrupt, boundary layer tripping was identified when the excitation was directed upstream at shallow angle to the surface.
机译：实验研究了从零净质量通量激发槽喷射到Blasius边界层中的一系列涡流对的演化，目的是激活边界层跳闸。激发以浅角度或垂直于表面的方向在上游或下游进行。计算了涡度，环流，轨迹和对流速度，并将其用于描述涡旋的演变。除PIV数据外，还测量了强制边界层的间歇性，光谱和平均速度分布。发现周期性激发对于促进亚临界转变非常有效。当激发以相对于表面的浅角度向上游定向时，可以识别出更有效，突然的边界层跳闸。

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