Discussion
Match each tunnel type in List I with its distinguishing feature in List II.
List I
A. Open-circuit subsonic
B. Transonic
C. Supersonic
D. Shock tunnel
List II
1. Ventilated test-section walls
2. Draws in and exhausts room air
3. Millisecond runs at very high stagnation enthalpy
4. A convergent-divergent nozzle and second throat
Select the correct match.
Answer: C
Each regime imposes its own requirement. Subsonic testing needs only a fan and a duct; transonic testing needs relief at the walls; supersonic testing needs a nozzle and an efficient diffuser; and hypersonic testing needs enthalpy that only a brief, violent process can supply.
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