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Mach number independence for conical cylinder is achieved at a lower Mach number compared to the sphere.

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Mach number independence for conical cylinder is achieved at a lower Mach number compared to the sphere.

(a) True

(b) False

The question was posed to me in final exam.

This key question is from Mach Number Independence topic in section Transonic and Hypersonic Flows of Aerodynamics

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Correct answer is (b) False

The explanation: The coefficient of drag over both conical cylinder and sphere becomes independent after a certain higher Mach number. This is known as Mach number independence. Although, this Mach number independence for sphere is achieve at a lower Mach number compared to the conical slender because for slender bodies, the Mach number independence occurs at a lower Mach number.

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