Discussion
Match each normal shock quantity at \( M_1 = 2 \) in List I with its value in List II.
List I
A. Downstream Mach number
B. Static pressure ratio
C. Density ratio
D. Stagnation pressure ratio
List II
1. 4.50
2. 0.577
3. 0.721
4. 2.67
Select the correct match.
Answer: D
These four numbers are worth memorising together, since Mach 2 is the standard worked example. The pressure has more than quadrupled, the density has not quite tripled, the flow has been taken well subsonic, and more than a quarter of the stagnation pressure has been destroyed.
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