Space-Time Evolution of Near-Wall Velocity Gradients that Generate Organized Streamwise Vorticity

将进行旨在澄清 产生流向的主要机制 在壁面有界流动中的壁面涡流。齐平的墙 安装的致动器将在基座中引入变形 层流，范围从纯应变到纯涡量。 诊断将来自利帕（激光诱导光化学 风速测定法）。 实验将定量识别近壁事件 引发流动扭曲，并与 主动边界层控制

Experiments will be conducted aimed at clarifying the predominant mechanism leading to the generation of streamwise vortices at the wall in wall-bounded flows. A flush, wall mounted actuator will introduce distortions into a base laminar flow, ranging from pure strain to pure vorticity. Diagnostics will be from LIPA (Laser Induced Photochemical Anemometry). The experiments will quantitatively identify near-wall events initiating flow distortion, and have strong relevance to active boundary layer control.