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The below figure shows which of the following wind tunnel?

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The below figure shows which of the following wind tunnel?

(a) Convergent duct

(b) Divergent duct

(c) Convergent-divergent duct

(d) Simple duct

This question was addressed to me in my homework.

My question comes from Incompressible Flow in Duct topic in portion Inviscid & Incompressible Flow of Aerodynamics

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The correct option is (c) Convergent-divergent duct

Explanation: The velocity increases in the convergent duct (V1) and the reaches V2 at the throat and the pressure becomes minimum at the throat condition. In the divergent section, the velocity decreases and the pressure begin to increases.

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