Discussion
Assertion (A): Shock tunnels are used for hypersonic testing despite run times of only milliseconds.
Reason (R): No continuous facility can affordably supply the stagnation enthalpy hypersonic flight requires.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second is the reason for the first. Reproducing the enormous stagnation temperature continuously would demand impossible power, whereas a reflected shock delivers it briefly and cheaply. Milliseconds is long enough for the flow to establish and be measured.
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