1. 1 Lecture 5: Propulsion Jason Mickey For AE 440 A/C Lecture September 2009

2. 2 Propulsion Responsibilities Select engine type and number of engines Find an engine that meets power requirements Determine SFC and fuel consumption Determine propulsion system integration losses Design fuel system and fuel tanks

3. 3 Engine Classifications Engines ReciprocatingTurbine Externally-driven Turboprop Propfan Internally-driven Turbofan Turbojet Ramjet/Scramjet

4. 4 Engine Considerations Specific Fuel Consumption Thrust Weight Size

5. 5 Typical Engine SFC

6. 6 Part-Power Operation Throttling back jet engines increases SFC Approximated by (13.9)

7. 7 Altitude Effect on SFC McCormick, Fig. 6.34

8. 8 Inlet Locations

9. 9 Inlet Types

10. 10 Propeller Locations

11. 11 Nozzle Types

12. 12 Installed Thrust where (13.5) (13.6)

13. 13 Installed Thrust Other causes of decreased thrust include –Drag caused by the engine –Air bleed –Power extraction

14. 14 Altitude Effect on Thrust McCormick, Fig. 6.34

15. 15 Suggestions for PDR Choose an engine Verify that power requirements are met for all phases of the mission Trade studies Give reasons for your decisions!