An experimental investigation was carried to study the unsteady flow characteristics of a round jet being excited electrically. Velocity measurement and flow visualization were performed by the hotwire anemometer and the Schlieren technique repeatedly. The Schlieren photographs synchronized with the signal of the unsteady part of the velocity reveal that the various vortex motion generated are related with velocity field by acoustic excitation in nozzle. In excited flow field, vortex motion is generated repeatedly due to shear generation near the pipe wall. In case of fuel jet excited as resonance frequency, flame length is greatly reduced by four fifth.
