気液二相流による直列二円柱の振動応答特性に関する研究 : 気泡径の相違の影響

概要

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We examined the vibration response characteristics of two circular cylinders in tandem, with a pitch-to-diameter (p/d) ratio of 1.5, subjected to two-phase cross-flows. The average bubble size was from 3.0 mm to 4.0 mm for a small-bubble two-phase flow and from 6.0 mm to 7.0 mm for a large one. Experiments were carried out to obtain the vibrational response of the circular cylinders for both bubble sizes, changing the void fraction from 0% to about 30% at various velocities ranging from 2 to 8. The experiments showed the following major results: 1) In tandem cylinders with p/d=1.5, air bubbles caused the cylinder system to excite vibratingly when the flow velocity was smaller than that producing the lock-in state in the two-cylinder system; 2) the response characteristic map in terms of void fraction and reduced velocity was made to investigate the effects of air bubble size on the tandem-cylinder's vibration; and 3) the smaller bubbles had less effect on the vibration response of the tandem cylinder system with respect to the reduction and excitation of vibration.
社団法人日本機械学会の論文
1990-07-25