Discussion
Because the first stage nozzle guide vanes are choked, the engine's
Answer: D
Correct answer: Corrected mass flow is fixed
A choked throat passes the maximum flow the upstream conditions allow, and nothing downstream can change it. The first stage nozzle guide vanes therefore fix the engine’s corrected mass flow \( \dot{m}\sqrt{T_0}/p_0 \) at a single value over almost the whole operating range, which is why the throat area is the designer’s principal handle for rematching an engine. Pressure ratio, turbine entry temperature and fuel flow all still vary with throttle.
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