文章基本信息

标题：ダブル光ファイバープローブを用いた気泡による乱流摩擦抵抗変化に関する研究
本地全文：下载
作者：拾井隆道 ; 濱田達也 ; 川北千春等
期刊名称：日本船舶海洋工学会論文集
印刷版ISSN：1880-3717
电子版ISSN：1881-1760
出版年度：2021
卷号：34
页码：37-49
DOI：10.2534/jjasnaoe.34.37
语种：Japanese
出版社：社団法人日本船舶海洋工学会
摘要：The shape of double optical fiber probe and analysis method for measuring bubbles near wall in turbulent boundary layer are proposed. The spanwise position of the probe is made to coincide, and it is tilted upward in order to enable the measurement of small bubbles and the measurement near wall. The measured data are filtered using a histogram, velocity ratio at the upstream and downstream sides of the bubble, and velocity gradient to eliminate the effects of bubble mismatching and deformation. The effectiveness of this method is confirmed in comparison with the result by Shadowgraphy. The bubble exists only near the wall and the bubble interface velocity near the wall is high when the friction drag is increased. The bubble interface velocity near the center of the channel is accelerated with increasing void fraction when the friction drag is reduced. The acceleration rate is on the same order as the rate of change of the drag reduction effect.