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Lecture 5: Propulsion

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

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Lecture 5: Propulsion

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

  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. Engine Classifications

  4. Engine Considerations • Specific Fuel Consumption • Thrust • Weight • Size

  5. Typical Engine SFC

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

  7. Altitude Effect on SFC McCormick, Fig. 6.34

  8. Inlet Locations

  9. Inlet Types

  10. Propeller Locations

  11. Nozzle Types

  12. Installed Thrust where (13.6) (13.5)

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

  14. Altitude Effect on Thrust McCormick, Fig. 6.34

  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!

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