Abstract
In this study, the characteristics of aerodynamic responses and the steady pressure distributions on the three circular cylinders in an equilateral-triangular arrangement were investigated by wind tunnel tests. The responses of three circular cylinders for various incidence angle α and spacing ratio S/D show more severe aerodynamic instadileties than those of two circular cylinders, especially the aerodynamic instability of downstream cylinder is remarkable. The “wake galloping” occurs as a different vibration mode in case of three cylinders and peculiar aerodynamic behaviors that have not occurred on two cylinders arises . As for the profiles of pressure distribution, the most complex feature can be found on the cylinder located in downstream. The profiles of pressure on downstream cylider varied through a certain procedure according to the increasing α for all S/D tested. By the results obtained, it can be observed that there is a close relation between the characteristics of aerodynamic responses and the profiles of steady pressure distribution on the three circular cylinders.
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