Question for all the turbine pilots out there.

captainphil

captainphil

Well-Known Member
I am taking an air carrier aircraft systems class and I came across a question , what is meant when it is said that an aircraft has a high bypass engine, and what would be the difference with an airplane that doesn't have one? Thanks
 
captainphil said:
I am taking an air carrier aircraft systems class and I came across a question , what is meant when it is said that an aircraft has a high bypass engine, and what would be the difference with an airplane that doesn't have one? Thanks
Click to expand...

The fan is bypassing air around the combustion chamber. This lowers the net speed of jet exhaust, lowers noise, and increases efficiency. The downside is that the front of the engine is larger.

Older engines (DC-8, 707) were low-bypass turbojets. Pure turbojets are only really used on military aircraft and cruise missiles, where size matters more than efficiency.
 
High bypass:
Turbofan3_Labelled.gif

Low bypass:
24080-004-E3162004.gif
 
Very informative diagram, So basically a high bypass system would be a turbofan and a low bypass would be a turbojet engine?
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Turbofans are either high bypass or low bypass. The difference is the amount of air that does not go through the turbine section.

Turbojets are engine that don't have a bypass at all.
 
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