Discussion
Statement I: The first stage nozzle guide vanes fix the engine's corrected mass flow.
Statement II: They run choked, so the flow through the throat is independent of downstream conditions.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. Once the throat is sonic, information cannot travel upstream, so the corrected flow is set by the throat area and the upstream conditions alone and is independent of everything downstream. The vanes therefore act as a fixed orifice for the whole engine, which is why the engine’s corrected flow is essentially constant over the operating range and why the throat area is the rematching parameter.
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