柔らかいフィンをもつ円管から流出する噴流の乱流特性(流体工学,流体機械)

概要

論文の詳細を見る
As a part of the study on the jet diffusion, the jet flow issuing from a circular pipe with the fluttering fins made of the artificial cellulose has been investigated. In this paper, the turbulent characteristics of this flow field were examined from the velocity information obtained by the highspeed PIV method. The experiment was carried out without the fins and with the fins having various lengths. As a result, it has been found that the turbulence is enhanced in the jet flow due to the fin oscillation and a large scale fluctuation appears with the increase of the fin length. From the results of the auto-correlation it has been clarified that the turbulent structure contained in the jet flow was destroyed by attaching the fins near the outer edge of the jet flow. Furthermore, from the continuous wavelet transform analysis of the fluctuating velocities, it has been recognized that the jet flow tends to contain the lower frequency with the increase of the fin length.
社団法人日本機械学会の論文
2008-11-25