Discussion
A fixed nozzle is adequate for an afterburning engine. True or false?
Answer: C
Correct answer: False, reheat needs a larger throat area
Reheat raises the exhaust temperature and hence the specific volume, so the same mass flow requires a substantially larger exit area. With a fixed nozzle the back pressure on the turbine would rise when reheat was lit, shifting the engine match and driving the compressor towards surge. The nozzle must therefore open as reheat is selected, whatever the duration and however the turbine is sized; thermal expansion of the structure is a separate and much smaller matter.
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