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How many throat/throats are there in a supersonic wind tunnel?

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How many throat/throats are there in a supersonic wind tunnel?

(a) 1

(b) 2

(c) 3

(d) 4

I had been asked this question in an international level competition.

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

1 Answer

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Correct option is (b) 2

The explanation is: In case of supersonic wind tunnels, there are two throats present. One is the nozzle throat where the sonic speed is achieved and the second throat is the diffuser throat where supersonic incoming flow is isentropically compressed to Mach 1.

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