Wind Tunnel Tests on Equal and Unequal Diameter Cylinders in Tandem

Abstract eng:
A series of experiments were conducted at the LSU Wind Tunnel Laboratory to estimate the mean drag and lift forces on groups of circular cylinders arranged in tandem. Of the many previous studies of aerodynamic forces on multiple cylinder configurations, only a few address the case of cylinders arranged in tandem under limited conditions. This study expanded the range of conditions over which these measurements have been made in order to better understand and quantify drag and lift forces in tandem arrangements of groups of cylinders. Tests were conducted with different cylinder sizes, spacings, surface roughnesses, under both smooth and turbulent flow conditions. The mean interference drag coefficients, combined drag coefficients, and lift coefficients were calculated based on experimental results. The flow turbulence, surface roughness and relative sizes of the cylinders were found to have significant impact on the behavior of aerodynamic forces on cylinders.

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