A New Concept Design of Ducted Fan VTOL Based on Torque Balance
This paper put the emphasis on the computation and analysis of the lift characteristics of the ducted fan S\VTOL aircraft. By applying the modified momentum-profile theory, the modified momentum-profile-theory model of ducted propeller is proposed which will be used in the concept design. CFD numerical simulation is carried out for a certain ducted tail rotor in different axial states, and some general rules of aerodynamics change of ducted propeller are obtained in the paper. A second correction is taken after analyzing the induced velocity distribution behind the propeller disk in the wake zone. A new concept of ducted fan based on Torque balance is proposed based on the research of ducted propeller. The initial optimization of the overall designing parameters is conducted in overall design level.