Discussion
Match each specialised facility in List I with its distinguishing purpose in List II.
List I
A. Water tunnel
B. Smoke tunnel
C. Automotive tunnel
D. Cryogenic tunnel
List II
1. Showing streamlines at low speed for teaching
2. Slow, clear observation of unsteady vortex flows
3. Full-scale Reynolds number at transonic Mach number
4. Testing over a moving ground plane
Select the correct match.
Answer: B
Each facility exists because a general-purpose tunnel cannot do that particular job well. Between them they cover clarity of observation, teaching, a correctly represented ground condition, and the Reynolds number that ordinary tunnels cannot reach.
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