this is about converging subsonic nozzles. Are they fully expanded? meaning exit pressure=ambient pressure?

What about diverging subsonic nozzle? Are they fully expanded? what would happen if the exit pressure was greater than ambient? shock formations?

  • $\begingroup$ Fully expanding nozzles in the subsonic regime... wouldn't that mean exit velocity = 0? This would be great for a turbo-prop engine but not for a turbofan/turbojet engine. Thrust on turbofan engines is often measured as an engine pressure ratio (EPR). During takeoff this ratio can reach 1.5 or 1.6, which means the exit pressure is 1.6x greater than the intake pressure. Shocks only form when the air exits at super-sonic speeds. $\endgroup$ – Jan Oct 27 '19 at 14:49

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