Evaluation of Drag and Lift Forces of Grooved Cylinders in Wind Tunnel
Keywords:
Flow around cylinder, grooved cylinder, Reynolds number, smoke visualization, wind tunnel testAbstract
It is shown that surface modifications on surface of a circular cylinder affects the separation point to move backward on the cylinder surface hence reducing the drag coefficient. The flow past a circular cylinder with smooth, half and full rectangular grooved surface (roughness coefficient k/D = 0.004) was investigated in a low speed open end wind tunnel. The outer diameter(D) of the cylinders is 50mm and the depth(k) of the groove is 2mm. The Reynolds number used in the study ranges from 1.65 ×104 to 1.13 ×105. The drag and lift coefficients of the cylinders were measured using a three-component balance. The wake flow pattern of the cylinders was observed based on a smoke visualization technique. The results showed that the full-grooved cylinder and the half-grooved cylinder facing the flow (front) produce lower drag compared to a smooth cylinder and half-grooved cylinder located at the leeside of the flow (rear). The presence of the grooves on the cylinder surface affects the boundary layer and shows a smaller and narrower wake compared to a smooth cylinder.References
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