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

将进行实验，目的是澄清在壁面有界流动中导致沿流涡在壁面产生的主要机制。一个齐平的，壁挂式执行器将引入扭曲到基本层流，从纯应变到纯涡量。诊断将来自LIPA（激光诱导光化学风速测定）。实验将定量识别引发流动畸变的近壁事件，并与主动边界层控制有很强的相关性。

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.