Discussion
Match each corner or surface in List I with the wave it produces in supersonic flow in List II.
List I
A. Convex corner
B. Concave corner
C. Gradually concave surface
D. Gradually convex surface
List II
1. A centred expansion fan
2. An attached oblique shock
3. Converging compression waves that coalesce into a shock
4. Diverging expansion waves that never coalesce
Select the correct match.
Answer: B
Whether the surface turns away from the flow or into it settles expansion against compression, and whether the turn is sharp or gradual settles centred against distributed. The asymmetry between the last two rows is the important one: compressions coalesce, expansions never do.
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