Yoshihiro Obata

Transitional Characteristics of Vortices Issued From A Body Which Creates Asymmetric Flow Field. In A Case of Thin Symmetrical Airfoil With Angle of Attack Under Rotational Oscillation of Small Amplitude.

An experimental study was carried out on vortices issued from a thin symmetrical airfoil with angle of attack under rotational oscillation of small amplitude. The experiments were conducted in a hydraulic flume using Laser Doppler Velocimetry (LDV) and ensemble averaging technique to map the unsteady velocity field about the vortex generating region. From this study, transitional characteristics of vortices issued from a body which creasts asymmetric flow field became clear. Especially, the reducing mechanism of circulation due to different flow characteristics between the upper and lower vortices became clear from investigation of time variation of the vorticity and shear velocity distributions.