Discussion
Which statement about inlet pressure recovery is TRUE?
Answer: C
Correct answer: A loss costs rather more than itself in thrust
Thrust is more than proportionally sensitive to pressure recovery: a loss of five percentage points typically costs six or seven per cent of thrust.
The reason is that lower total pressure reduces both the mass flow the engine can pass and the pressure ratio available across the nozzle, so the two effects compound. It matters at every speed, not only supersonically - which is why even a simple subsonic pitot inlet is shaped with care to reach recoveries above 0.98.
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