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Study on Drag Coefficient for the Flow Past a Cylinder

Drag is the heart of aerodynamic design. The accurate assessment of drag results in economic design of automobiles, chimneys, towers, buildings, hydraulic structures etc. The present work is the result of extensive experimentation on cylindrical bodies with varying cylinder diameters and air velocity. The drag coefficient of a cylinder was calculated from data obtained by performing tests in an air flow bench (AF12) with varying flow velocities and diameters as 12.5mm, 15 mm, 20 mm, and 25 mm. To obtain the values of co-efficient of drag, two methods: (i) direct weighing method, and (ii) pressure distribution around the cylinder, has been used. Two methods of analysis were used to calculate drag measurements on the cylinder: A comparison has been made between the co-efficient of drag obtained by the two methods. A marked deviation in two values of the co-efficient of drag is observed. This is due to the formation of boundary layer on the surface of the cylinder. The co-efficient of drag obtained by weighing method is more accurate than those obtained from pressure distribution.