A question that I have been wondering about lately is whether it would be possible to power the fan in a modern hi-bypass turbofan with an electric motor and achieve performance comparable to the kerosene-fueled engine. Or is the 10% of air that flows through the combustion chamber crucial for the operation of the system?
(I wish to ignore all things that make electric aircraft unviable, like power-to-weight ratio of engines and battery capacity)
Edit: I have realized that the "electric" part of the question is really not the core of the question. What I am really interested in is whether it would be feasible to power a plane using only the fan and not the exhaust jet with a performance similar to a current jet (which would make the engine similar to a turboprop with many blades and a cover around it)