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What is the reduction of drag by installing the small cylinder?

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in Aerodynamics by (773k points)
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

1 Answer

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Best 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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