Reply To: mach at inlet higher than at throat nozzle

[Essence]

I see the throat area too small. Is the area ratio correct? If you need Ma = 3 at the outlet, then according to the isentropic relations, P/Po = 0.02722, A/A = 4.234 and P/P* = 0.0515. But you have applied P/Po = 30/10^5 = 0.0003.