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How is the flow compressed in an ideal supersonic wind tunnel inside a diffuser?

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How is the flow compressed in an ideal supersonic wind tunnel inside a diffuser?

(a) Isentropic

(b) Adibatic

(c) Isochoric

(d) Isobaric

The question was asked by my college director while I was bunking the class.

The origin of the question is Compressible Flow through Diffusers topic in chapter Compressible Flow through Nozzles, Diffusers and Wind Tunnels of Aerodynamics

1 Answer

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Best answer
Right answer is (a) Isentropic

Easy explanation: In an ideal supersonic diffuser, the air is slowed to subsonic speed and then expended to the atmosphere. This is done by isentropic compression as ideally there should be no loss in total pressure.

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