Turboprop
The turboprop is similar to the turbojet, except that most of the nozzle gas pressure drives the turbine shaft -- by the time the gas gets past the turbine, there's very little pressure left to create thrust.
Instead, the shaft is geared to a propeller which creates the majority of the thrust. 'Jet' helicopters work the same way, except that their engines are connected to the main rotor shaft instead of a propeller.
Turboprops are more fuel efficient than turbojets at low altitudes, where the thicker air gives a propeller a lot more 'traction.' This makes them popular on planes used for short flights, where the time spent at low altitudes represents a greater percentage of the overall flight time.
Turbofan
The turbofan is something like a compromise between a pure turbojet and a turboprop. It works like the turbojet, except that the turbine shaft also drives an external fan, usually located at the front of the engine.
The fan has more blades than a propeller and spins much faster. It also features a shroud around its perimeter, which helps to capture and focus the air flowing through it. These features enable the fan to generate some thrust at high altitudes, where a propeller would be ineffective.
Much of the thrust still comes from the exhaust jet, but the addition of the fan makes the engine more fuel efficient than a pure turbojet. Most modern jetliners now feature turbofan engines.
Thursday, November 20, 2008
Jet Propulsion Part 2
Posted by Nanang Suryana at 10:14 PM
Labels: Animated Engines
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17 Comments:
just Drop ,give back the smile..And For All Love N peace
http://sahadewa-cell.blogspot.com
wah apaan tuh, good posting
im back 2 give u $mile$
1 SSmile 4 u, just 1x...thx
give u smile, please visit mine too, thanks
nice...blog...visit..me..backk..thanks...
nice one... i am mechanical graduates background also blogging... cheerSS!!
im here for smile for u, plase smile to for me too friends, now im folloes u, pls follow me too
thank you for your visit...
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from: INDONESIA CRYING
visit...back to visit ok...
Thanks, I follow you. Follow me too. Regards. Seno.
one smile 4 u frenn,,smile back
im follow ur and thanks for ur smile, now is my smile for u
ini jet pesawat tempur kan mas..hehehe hbsnya zie ga ngerti bahasa enginering ... zie tahunya hewan
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cool jet plan... :)
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