気液二相流における振動直列二円柱に作用する非定常流体力特性に関する研究

概要

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In this study, we experimentaly examined the characteristics of unsteady fluid forces acting on the downstream cylinder of a two-tandem-cylinder system in the lift direction at P/D=3.0 subjected to two-phase bubble cross flow. The downstream cylinder was oscillated to measure the unsteady fluid force at the frequency (f_P) which is a natural frequency of the upstream cylinder in water. Experiments showed the following major results : ( 1 ) At low reduced velocity, we could not observe the differences in the characteristics of unsteady fluid force, that is with respect to void fraction and oscillation amplitude ; ( 2 ) air bubbles decreased the fluid force for the reduced velocity over the value of that in lock-in the state ; ( 3 ) the fluid force was reduced by air bubbles at the void fraction of α≦ 5% for high reduced velocities.
社団法人日本機械学会の論文
1992-12-25