What is the drag induced by a turbo bypass jet engine in a typical most modern airliner like the 777, the Jumbo Jet (Boeing 747-8) and the Airbus A380?
Given that the jet is travelling faster than the replacement of the air displaced by the engine suction, do parts in close proximity to this area where suction is largest cause less drag to the aircraft because of this micro second vaccum period occuring at all times when the aircraft is in cruise mid air? I refer to turbo bypass engines because they are the ones most used because of fuel efficiency, noise, etc., in airliners, I do not ask about bypass ratio. I ask about the displaced air outside the engine, and the overall effect on drag caused by the engine as a physical component attached to the plane colliding with air.
Does the fact that it is sucking a very large amount of air around it reduce this drag and by how much compared to if it were not sucking any air at all?