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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISBN Druckformat: 978-1-56700-497-7 (Flash Drive)
ISBN Online: 978-1-56700-496-0

Experimental Study of Flow over Asymmetric Undulation Foil Attached to Square Cylinder at an Intermediate Reynolds Number

DOI: 10.1615/IHMTC-2019.1530
pages 913-917

Kamal Raj Sharma
Aerodynamics Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Utt arakhand-247667, India

Sushanta Dutta
Mechanical and Industrial Engineering Department, IIT Roorkee, Roorkee, Uttarakhand, India

Abstrakt

Effects of asymmetric undulations of a flexible foil on a flow over a square cylinder have been evaluated using two-component particle image velocimetry (2C-PIV) and hotwire anemometry (CTA). An intermediate flow regime is chosen for the study. A comparison between the symmetric and asymmetric undulating foil have also been drawn. The long foil is chosen for the study. The results reveal that both the symmetric and asymmetric undulation foil suppress the vortex shedding phenomenon of the bluff body. The asymmetric undulation of the foil deflects the wake thus breaks the symmetry of near wake, which infers to the positive lift generation. The undulation foil also modulates the mean drag of the bluff body. The asymmetric undulation of the foil proves to be better wake manipulator than symmetric undulation.