Abstract
By using the methods of the flow visualization and the PIV, the diffusion of water jet flow issuing from the circular pipe with the fluttering fin has been described in this paper. Moreover, the large and middle scale structures of the jet have been investigated by applying the wavelet multi-resolution analysis to the image information obtained from the LIF method. As a result, it has been found that the jet diffusion is largely affected by the fluttering fin and the difference of the structure is recognized between the water jet with the fluttering fin and that without one.
