Discussion
A scramjet differs from a ramjet in that combustion occurs
Answer: B
Correct answer: In supersonic flow
The scramjet - supersonic combustion ramjet - decelerates the captured air only partially, so it enters the combustor still supersonic, perhaps at Mach 2 or 3 from a flight Mach number of 8. Burning in that stream avoids the enormous stagnation temperature that full deceleration would produce. The price is that the fuel has milliseconds in which to mix, ignite and burn, which is the central difficulty of the whole concept.
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