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How is diffuser throat area At2 related to the nozzle throat area At1?

Correct Answer: At2 > At1
There are two throats in the supersonic wind tunnel. The first is that of the nozzle and the second is that of the diffuser. The nozzle’s throat region is equal to A * (sonic area) and the diffuser’s throat area is greater than the nozzle’s throat area because of the rise in entropy within the diffuser.

Why is the diffuser throat area greater than the nozzle throat area?

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