Engine Nozzle Requirements Accelerate flow to high velocity with minimum Po loss Match pe to patm Mix core and bypass streams turbofans Allow for thrust reversing and or vectoring Allow for wall cooling if necessary Low jet noise and emissions environment or stealth Permit afterburner operation without affecting main engine operation variable area nozzle Minimal cost weight drag Long life good reliability low maintenance Seitzman Engine Nozzles 1 AE4451 Propulsion Converging vs C D Nozzles Converging nozzles for subsonic aircraft with nozzle pressure ratio Po Pa 4 Converging diverging nozzles for supersonic high speed subsonic afterburning require variable geometry C L Seitzman Engine Nozzles 2 Figure 10 52 from Mattingly Elements of Gas Turbine Propulsion AE4451 Propulsion All figures from Mattingly Elements of Gas Turbine Propulsion Seitzman Engine Nozzles 3 AE4451 Propulsion Seitzman Engine Nozzles 4 AE4451 Propulsion
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