G903 壁面近傍におかれた接線方向吹出し円柱の後流振動特性(2)(GS9 振動,騒音,一般セッション)

概要

論文の詳細を見る
The wake oscillation of a circular cylinder, which is placed near a plane boundary, with tangential blowing from a surface slot is investigated experimentally at Reynolds number Re=2.7×10^44. The time-mean surface pressure measurements on the circular cylinder, flow visualizations and velocity fluctuation measurements were carried out for various jet momentum coefficient, C_μ, and clearances between the circular cylinder and the plane boundary changed. Based on these experiments it is found that periodic velocity fluctuation, which is associated with vortex shedding (Karman vortices), is suppressed by the tangential blowing. However, in the case of the cylinder placed near the plane boundary, the reverse flow occurs in the clearance between the cylinder and the plane boundary, in particular C_μ increases. The level of flow unsteadiness naturally increases.
一般社団法人日本機械学会の論文
2007-11-17