Flow around three rectangular cylinders arranged in connected and separated Y-shape

摘要

Characteristics of cross flow around three rectangular cylinders with two aspect ratios of breadth to width arranged in connected and separated Y-shape at various angles of incident flow were studied by means of force measurement in a wind tunnel. Flow visualizations with smoke-wire technique at typical cases were also given. Different types of flow patterns were formed for individual models at different angles of incident flow. In combination with the results of fluctuating velocity measurement in the wake, vibration features were determined. It shows that as the wind direction is in line with one limb or rectangular cylinder of the model, oscillation is weak, whereas the wind direction is in line with the bisector line of two limbs or cylinders, vibration is strong. The vibration is associated with the regular vortex shedding.