Air Engines

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Air Engines

  1. 1. Air Engines CUO Tonya Brown Apr 11 Flying Camp: Basic/Proficiency/Advanced Aviationnews.eu
  2. 2. Aim <ul><li>State the basic principles of operation and identify the basic components of: </li></ul><ul><ul><li>A four stroke cycle internal combustion engine </li></ul></ul><ul><ul><li>Basic turbo jet engine </li></ul></ul><ul><li>Demonstration of a type of thrust similar to that of engines found in jet aircraft </li></ul>Airforce.gov.au
  3. 3. Four Stroke Piston Aircraft Engine <ul><li>This has a cycle of four operations: </li></ul><ul><li>1. Induction </li></ul><ul><li>2. Compression </li></ul><ul><li>3. Expansion (or Ignition) </li></ul><ul><li>4. Exhaust </li></ul>Aussiex.org
  4. 4. Induction <ul><li>Inlet valve opens </li></ul><ul><li>Down stroke, to allow mixture of fuel and air into cylinder chamber </li></ul>
  5. 5. Compression <ul><li>Compression </li></ul><ul><li>Both valves remain closed </li></ul><ul><li>Rising piston compresses mixture </li></ul>
  6. 6. Power/Ignition <ul><li>Piston reaches end of compression </li></ul><ul><li>Inlet and Exhaust valves both closed </li></ul><ul><li>Mixture ignited by an electrical spark </li></ul><ul><li>The heat generated rapidly expands mixture </li></ul><ul><li>Forcing the piston down, thus turning the crankshaft </li></ul>
  7. 7. Exhaust <ul><li>At the beginning of final up stroke </li></ul><ul><li>Exhaust valve opened (Inlet valve remains closed) </li></ul><ul><li>Burnt gases released into atmosphere </li></ul><ul><li>Complete sweeping of cylinder by piston during upward travel cleans for next cycle </li></ul>
  8. 8. The Jet Engine <ul><li>Sequence of induction, compression, expansion and exhaust can be applied to turbo jet engine </li></ul><ul><li>All of these processes occur continuously in engine and delivery is uninterrupted (unlike a piston engine) </li></ul>Airforce.gov.au
  9. 9. <ul><li>Turbojet engine has no reciprocating parts </li></ul><ul><li>Therefore mechanically smoother and parts are less stressed than a piston engine </li></ul><ul><li>Figure shows general make-up of basic gas turbine engine </li></ul>
  10. 10. <ul><li>Incoming air is squeezed through the front fan (compressor) into the compression chamber </li></ul><ul><li>Add the fuel and ignited </li></ul><ul><li>Gases expand and flow out the rear of the engine </li></ul>
  11. 11. <ul><li>To maintain the movement of the compressor another fan (rear turbine) is located at the rear. Connected to the compressor by a shaft </li></ul><ul><li>Fan turned by hot gases passing through at very high velocity </li></ul><ul><li>After passing through turbine, the heated gases, still expanding, leave from exhaust nozzle as a jet </li></ul>
  12. 12. Afterburning (Reheat) <ul><li>Used for obtaining additional power </li></ul><ul><li>Feeding fuel into hot gases at back of engine </li></ul><ul><li>Heats the gases even more </li></ul><ul><li>Fuel ignited as soon as it comes in contact w/ hot gases </li></ul><ul><li>Increased expansion of air which was originally drawn from front gives aircraft extra thrust </li></ul>Airshow-reviews.com
  13. 13. Use of Afterburning <ul><li>Uses very large amount of fuel </li></ul><ul><li>Usually used to: </li></ul><ul><ul><li>Shorten take-off </li></ul></ul><ul><ul><li>Increase rate of climb </li></ul></ul><ul><ul><li>Give extra speed for a short period of time </li></ul></ul>Birch.family.tripod.com
  14. 14. Like this... <ul><li>Newlunches.com </li></ul>
  15. 15. No, obviously like this... Pixdaus.com
  16. 16. Model Air Engine <ul><li>Imagine that... </li></ul><ul><ul><li>Straw = Fuselage </li></ul></ul><ul><ul><li>Balloon = Aircraft Engine </li></ul></ul><ul><li>Air propelled to create forward motion </li></ul>

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