|Quoting flyflewflown (Thread starter):|
Modern high bypass jet engines are almost shrouded prop planes where the "prop" is driven by a turbine rather than a reciprocating engine. A modern bypass engine has say a 8 or 10:1 ratio. Not too much Jet there, more fan / prop.
Would it make sense to separate those two components, for example, put the core of the engine on top of the fuselage and the fan part below the wing? It seems that bypass ratios have been increasing faster than core sizes and the total diameter may start to become an issue (requires heavier landing gear etc).
Additionally, would a pure jet core be better off with a faster spinning compressor? It seems to me that right now the maximum compression to a degree is limited by the radius of the fan (speed of sound).
Apologies in advance if this a complete newbie question. The search function does not seem to work so well..
|Quoting flyflewflown (Reply 2):|
GTFs seem to be a patch – trying to bridge the different strengths and requirements of the bypass / fan/prop component and the turbine part of the engine. Given the high efficiency of electric motors perhaps it would be possible to drive the fans, in whatever location makes most sense, electrically, and generate the power with generators driven by jets? After all, the energy density of liquid carbohydrate fuels is (still) unsurpassed.
|Quoting kurtverbose (Reply 4):|
I don't think they'd be as efficient though as drag would probably be higher
|Quoting flyflewflown (Reply 2):|
Given the high efficiency of electric motors perhaps it would be possible to drive the fans, in whatever location makes most sense, electrically, and generate the power with generators driven by jets? After all, the energy density of liquid carbohydrate fuels is (still) unsurpassed.
|Quoting rwessel (Reply 7):|
Now that design has certainly been used in some large warships and is quite common in locomotives (where the high and controllable torque is especially valued), but those are both applications where weight is (relative to aircraft) a complete non-issue.
|Quoting TheSonntag (Reply 8):|
Diesel locos are also doing so well because they use the same electric motors as electrified locos, so no expensive new development was necessary.
|Quoting bluejuice (Reply 10):|
By separating the two, the engines will require hushkits which increase weight, costs and complexity while reducing efficiency.
Military Aircraft Every type from fighters to helicopters from air forces around the globe
Classic Airliners Props and jets from the good old days
Flight Decks Views from inside the cockpit
Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior
Cargo Aircraft Pictures of great freighter aircraft
Government Aircraft Aircraft flying government officials
Helicopters Our large helicopter section. Both military and civil versions
Blimps / Airships Everything from the Goodyear blimp to the Zeppelin
Night Photos Beautiful shots taken while the sun is below the horizon
Accidents Accident, incident and crash related photos
Air to Air Photos taken by airborne photographers of airborne aircraft
Special Paint Schemes Aircraft painted in beautiful and original liveries
Airport Overviews Airport overviews from the air or ground
Tails and Winglets Tail and Winglet closeups with beautiful airline logos