TITLE:
Drag Reduction and Secondary-Flow Occurrence by Square Biplane Grid
AUTHORS:
Yoshino Tachimoto, Mitsuo Iwamoto, Hidemi Yamada
KEYWORDS:
Biplane Grid, Circular Cylinders, Surface Pressure Distribution, Drag Coefficient, Flow Visualization
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.8 No.1,
March
29,
2018
ABSTRACT:
In this paper, the characteristics of the three-dimensional flow field around the circular cylinder members forming a square biplane grid were experimentally investigated by using a wind tunnel and a water tunnel. In the wind tunnel testing, the span wise and circumference pressure distributions of surface on the circular cylinder were measured on the center mesh members formed by biplane grid in detail. Local drag coefficient was calculated from the surface pressure distributions. In addition, the flow visualization was performed in the water tunnel. As a result, it was suggested that the flow penetrating the contact region produced secondary-flow behind the biplane grid. Accordingly, the drag reduction would be caused by the presence of the secondary-flow.