Discussion
Match each critical ratio for air in List I with its value in List II.
List I
A. Critical temperature over stagnation temperature
B. Critical pressure over stagnation pressure
C. Stagnation over static pressure at Mach one
D. Stagnation over static density at Mach one
List II
1. 0.528
2. 0.833
3. 1.577
4. 1.893
Select the correct match.
Answer: C
All four follow from the isentropic relations at Mach one with a specific heat ratio of 1.4. The critical pressure ratio of 0.528 is the one most worth committing to memory, since it is the back-pressure fraction below which a converging nozzle chokes and its mass flow becomes fixed.
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