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

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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. ***