PPRuNe Forums - View Single Post - Qantas A380 uncontained #2 engine failure
Old 2nd Dec 2010, 22:18
  #1548 (permalink)  
ChristiaanJ
 
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The whole thing about exactly where the thrust comes from and how it gets transferred is not at all obvious.

If the engine is treated as a black box, basic formulae of "how much air (mass) enters at what speed and pressure" and "how much air (mass) exits at what speed and pressure" will give you the thrust.

But where exactly that thrust is generated, at what location in the engine, and how it's transferred to the rest of the aircraft structure, is a totally different story.

On Concorde, at supersonic cruise, about two-thirds (!) of the thrust came from.... the intakes.
Concorde engine intake "Thrust".

But even in a Trent, it's not the fan that's "dragging" the aircraft along by the shaft.
Unless you take all the pressure distributions into account, the discussion makes little sense.

CJ
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