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Which nozzle is used in supersonic wind tunnel?

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Which nozzle is used in supersonic wind tunnel?

(a) Convergent

(b) Divergent

(c) Convergent – Divergent

(d) Conical

The question was asked during an interview for a job.

The question is from Supersonic Wind Tunnels in section Compressible Flow through Nozzles, Diffusers and Wind Tunnels of Aerodynamics

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The correct option is (c) Convergent – Divergent

Easy explanation: Supersonic wind tunnel produces flow of Mach number above 1. This is achieved using convergent – divergent nozzle. This selection is based on area – velocity relation, according to which the subsonic flow accelerates in the convergent section to sonic speed after which the speed is further accelerated in the divergent section.

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