Abstract
The velocity field of the controlled jet is measured x-type hot wire probe. From the result of power spectrum analysis of streamwise velocity fluctuation at the nozzle exit, in the case of VR=1.0, a resonant mode is found for the frequency of acoustic excitation, and this resonant mode contributes to the promotion jet diffusion. In the case of VR=0.5, a lot of mode are found and non-liner interference between different modes. This non-linear interaction between different modes seems to suppress the radial direction velocity fluctuation of the film flow, and seems to restrain the diffusion of the jet.
