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Why is hypersonic similarity parameter essential?

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Why is hypersonic similarity parameter essential?

(a) Supersonic flow over wedges

(b) Hypersonic flow over slender bodies

(c) Hypersonic flow over cone

(d) Hypersonic flow over flat plate

The question was posed to me in unit test.

Query is from Hypersonic Similarity topic in division Transonic and Hypersonic Flows of Aerodynamics

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Right answer is (b) Hypersonic flow over slender bodies

Easiest explanation: Hypersonic similarity parameter K is an important governing parameter in order to study the hypersonic flow i.e. flow with Mach number greater than 5 over slender bodies. It is given by the product of free stream Mach number and flow deflection angle.

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