摘要
The aerodynamic properties and the mechanisms of the aerodynamic behaviors on two-dimensional tandem bluff bodies were investigated by measurements of unsteady pressure distributions around the cylinders and the flow visualization technique. Two rectangular cylinders, two circular cylinders placed in series in a flow and a single circular cylinder with a fixed splitter plate submerged in a wake were tested in this paper. The torsional vortex-induced oscillation of two tandem rectangular cylinders mutually rigidly connected was very sensitive to the spacing ratio between two cylinders. Both the accelerated "gap flow" and the accelerated "outside flow" a round the downstream cylinder played important roles in the violent cross-wind oscillation of two tandem circular cylinders with a spacing ratio of L
/D = 3. The violent cross-wind oscillation of the single circular cylinder with a splitter plate had a similar mechnism to conventional galloping of a two-dimensional rectangular cylinder from the standpoint of being caused by the existence of an inner circulatory flow. © 1986.