Discussion
An afterburning engine lights reheat and the nozzle area remains fixed by a mechanical failure. Turbine entry temperature rises and the compressor approaches surge.
Why does a fixed nozzle produce this result?
Answer: D
Reheat raises the gas temperature and therefore its specific volume, so the same mass flow needs a larger throat. With the throat fixed the back pressure rises, the turbine expands less and the whole engine rematches unfavourably.
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