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What is the reduction of drag by installing the small cylinder?(a) 48%(b) 55%(c) 30%(d) 75%The question was posed to me during an interview.I want to ask this question from Lifting Flow over Cylinder topic in section Inviscid & Incompressible Flow of Aerodynamics

Answer»

Right choice is (a) 48%

To explain I would say: A 48% DRAG reduction of a cylinder by installing a much smaller cylinder in the UPSTREAM direction of flow. The shear LAYER coming from the smaller cylinder CHANGES the pressure DISTRIBUTION around the layer cylinder in such a way that the drag is dramatically altered.



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