Discussion
Consider the following statements about the flow regimes:
1. Transonic flow contains both subsonic and supersonic regions in the same field.
2. Hypersonic flow is conventionally taken to begin above about Mach five.
3. Supersonic flow is conventionally taken to begin above about Mach 0.3.
Which of the statements given above is or are correct?
Answer: C
The first two are the standard definitions. The third confuses two different thresholds: Mach 0.3 is where compressibility begins to matter, whereas supersonic flow begins at Mach one by definition, since that is where the flow speed equals the local speed of sound.
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