Smog visualization technique of asymmetric vortices on forebody at high wind speed

We have obtained a clear, integrated and steady image of vortices athigh wind speed (60m/s) in the routine wind tunnel by setting a smokeorifice on the surface of the slender cylinder body and infusing theatomized oil with the new type of liquid droplet seeding generator. Asimple technique is developed to measure the vortice position bycalibrating at the same state and drawing grids in the same scale. Itprovides a useful technical platform for the research of Reynolds numbereffect on asymmetric vortices at a forebody.