The present study aimed at assessing a novel annular-ducted fan lift system for VTOL planes through computational fluid makeup (CFD) simulations. The electricity and lift efficiency from the lift fan system in hover mode, the move and drag in move mode, the actual drag and flight speed of the aircraft in cruise mode and the pneumatic coupling of the particular tip turbine and plane exhaust were studied. The results show the fact that annular-ducted fan lift system may have higher lift efficiency than the rotor of the Apache heli-copter; the smooth transition via vertical takeoff to cruise flight needs odds of forward thrust to overcome the minimum peak of drag; the aircraft when using the lift fan system dark during cruise flight theoretically may fly faster when compared with helicopters and tiltrotors based on aerodynamic drag prediction, from the elimination of rotor lug and compressibility effects to the rotor blade tips; and pneumatic coupling belonging to the tip turbine and jet exhaust of a 300 m/s velocity can provide enough moment to rotate the lift fan. The CFD results produce insight for future experimental study on the annular-ducted lift fan VTOL plane.

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