Abstract
To reveal the flow characteristics of the jet flow issuing from circular pipe, affected by the reciprocal oscillating flow, the velocity measurement of the jet was performed by using PIV method. The reciprocal oscillating flows issue from two circular pipes placed at both side of the free jet. And these flows have the contrary phase each other. Moreover, in order to investigate the coherent structure of the jet flow the continuous wavelet transform was conducted using the fluctuating velocity obtained from the PIV. As a result, it has been clarified that the jet diffusion is promoted by adding the reciprocal oscillating flow. Moreover, it has been also found from the results of wavelet analysis that the adding effect of the reciprocal oscillating flow appears in the band of the relatively low frequency.
