air engines
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Air Engines
CUO Tonya Brown Apr 11
Flying Camp:Basic/Proficiency/Advanced
Aviationnews.eu
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Aim• State the basic principles of operation and
identify the basic components of:– A four stroke cycle internal combustion engine– Basic turbo jet engine
• Demonstration of a type of thrust similar to that of engines found in jet aircraft
Airforce.gov.au
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Four Stroke Piston Aircraft Engine
• This has a cycle of four operations:1. Induction2. Compression3. Expansion (or Ignition)4. Exhaust
Aussiex.org
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Induction
• Inlet valve opens• Down stroke, to allow mixture
of fuel and air into cylinder chamber
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Compression
• Compression• Both valves remain closed• Rising piston compresses
mixture
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Power/Ignition• Piston reaches end of compression• Inlet and Exhaust valves both
closed• Mixture ignited by an electrical
spark• The heat generated rapidly
expands mixture• Forcing the piston down, thus
turning the crankshaft
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Exhaust
• At the beginning of final up stroke
• Exhaust valve opened (Inlet valve remains closed)
• Burnt gases released into atmosphere
• Complete sweeping of cylinder by piston during upward travel cleans for next cycle
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The Jet Engine
• Sequence of induction, compression, expansion and exhaust can be applied to turbo jet engine
• All of these processes occur continuously in engine and delivery is uninterrupted (unlike a piston engine)
Airforce.gov.au
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• Turbojet engine has no reciprocating parts• Therefore mechanically smoother and parts
are less stressed than a piston engine• Figure shows general make-up of basic gas
turbine engine
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• Incoming air is squeezed through the front fan (compressor) into the compression chamber
• Add the fuel and ignited• Gases expand and flow out the rear of the
engine
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• To maintain the movement of the compressor another fan (rear turbine) is located at the rear. Connected to the compressor by a shaft
• Fan turned by hot gases passing through at very high velocity
• After passing through turbine, the heated gases, still expanding, leave from exhaust nozzle as a jet
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Afterburning (Reheat)
• Used for obtaining additional power • Feeding fuel into hot gases at back of engine• Heats the gases even more• Fuel ignited as soon as it comes in contact w/
hot gases• Increased expansion of air which was
originally drawn from front gives aircraft extra thrust
Airshow-reviews.com
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Use of Afterburning
• Uses very large amount of fuel• Usually used to:– Shorten take-off– Increase rate of climb– Give extra speed for a short period of time
Birch.family.tripod.com
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Like this...
Newlunches.com
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Pixdaus.com
No, obviously like this...
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Model Air Engine
• Imagine that...– Straw = Fuselage– Balloon = Aircraft Engine
• Air propelled to create forward motion