Famous manufacteurs - Snecma, CFM, Cruise Altitude Efficiency - 30,000 and 40,000ft, Generate high subsonic speed - 900km/h, Limitation compared to low-bypass - High-bypass turbofans are not efficient at higher altitudes, High power to weight ratio - More thrust for less engine weight, High range - Longer flights possible, Highly fuel efficient - Good bypass ratio, Less fuel means: - less pollution , Less fuel means also - longer range, Less fuel means and - More money, HB turbofans have a large fan duct and heavy weight - Bigger size and heavier structure, Other famous manufacturers - Rolls Royce, Generate supersonic speed - low-bypass turbofan, Afterburning (or reheat) capacity - Going very fast, An afterburner is a device - Boosts jet velocity with more fuel combustion, Shape is more streamlined - Aerodynamics of low-bypass turbofans, Lower fuel efficiency - Consumes more fuel than HB turbofan , Shorter range - compared to HB turbofans, Nacelle - Outer shell that covers and protects the engine components, Fan - The large rotating blades that suck in the air at the front of the engine, APU - Provides electricity and bleed air to start the engines, Gearbox - Allows the fan and turbines to spin at different speeds for better efficiency and less noise, Primary flow - Air that goes through the core and combustion chamber, Secondary flow - Air that bypasses the core,

TURBOFANS

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