What happens to air flowing at the speed of sound when it enters a converging duct?
- Velocity increases, pressure and density decreases.
- Velocity, pressure and density increase.
- Velocity decreases, pressure and density increase.
Explanation from PART66Online
When supersonic or sonic flow enters a converging duct it behaves opposite to subsonic flow: the convergence acts like a diffuser, so velocity falls while pressure and density rise. This reversal occurs because compressibility dominates once the flow is at or above the speed of sound, which is why a subsonic nozzle must instead converge to speed flow up.
R
rusuvalentin asked · 10 Jul 2020
Why?
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