The Structure and Evolution of Streamwise Vortices by Pitched and Skewed Wall Jets

[305943]约翰斯顿一种叫做VGJ（涡发生器射流）的涡发生器将被实验研究。已知从壁面喷射到相邻边界层流动的倾斜射流会产生流向涡，可用于边界层和分离控制。它们的详细机制和行为范围仍然很不清楚。这项研究是为了获得注入口下游不同横流平面的平均速度和湍流速度的详细测量。基本实验工具是LDV，实验将在水流设施中进行。还将获得流可视化。这种装置可能对控制分离很有用，但与传统的固体涡旋发生器不同，它们提供了主动控制的可能性。* * *

9305943 Johnston A type of vortex generator here called VGJ (for vortex generator jets) is to be investigated experimentally. Skewed jets injected from a wall into the adjacent boundary layer flow are known to generate streamwise vortices that can be used for boundary layer and separation control. Their detailed mechanisms and range of behavior are still poorly mapped out. This investigation is to obtain detailed measurements of mean and turbulent velocities in various cross-stream planes downstream if the injection ports. The basic experimental tool is LDV, and the experiments are to be conducted in a water flow facility. Flow visualizations will also be obtained. Such devices could be useful for the control of separation, but unlike conventional solid body vortex generators they offer the possibility of active control. ***