Pressure distributions on three circular cylinders in different equilateral-triangular arrangements at subcritical Reynolds Number

摘要

Pressure distributions on three circular cylinders in different equilateral-triangular arrangements were investigated by wind tunnel test at a subcritical Reynolds number of 5.5x10~4. The spacing ratios of their centers were in the range 1.7 <=N/d<=5.0. It has been shown that the angles of incident flow strongly in-fluence the pressure distributions on any one of the cylinders. Due to the interference of the shear layers and/or wakes, the most complex features of pressure distributions can be found on the cylinder located in downstream. As to the levels of interference regarding to the effect of spacing ratio, the results show mainly four different effect regions, i.e. effect of small, medium, transition and larger spacing can be identified. In small spacing, further more, three basic types of flow pattern can be classified due to various angles of incident flow. These are flow patterns of proximity effect, shear layer reattachment effect and wake effect.