Discussion
Fuel residence time in a scramjet combustor is of the order of
Answer: D
Correct answer: A few milliseconds
A combustor a metre or two long with flow passing at one to two kilometres per second gives a residence time of the order of a millisecond:
\[ t = \frac{L}{V} = \frac{1.5}{1500} = 10^{-3} \text{ s} \]Everything - injection, penetration into the core flow, molecular mixing, ignition and heat release - must be complete within that window. It is why hydrogen, with its very fast chemistry, is the reference fuel, and why so much scramjet work is about injector geometry and mixing enhancement.
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