Based on the vortex theory and thin airfoil method,an engineering-oriented method for the ducted-propeller anti-torque system was investigated,included the airfoil shaped ducted body,propeller and the central body modelling technology.

This paper introduces current development and trends of ducted fan flying robot which takes advantages of VTOL(Vertical Take-Off and Landing) techniques.

Compared with the propeller or the rotor,the ducted fan provides a larger aerodynamic thrust(lift) and the low noise due to the shrouding duct.

Some unmanned aerial vehicles can vertically take off and land with the ducted fan system, but there is no valid method to analyze the aerodynamic characteristics of a ducted fan system currently.

The flow field and performance of a helicopter ducted tail rotor in hovering and sideward flight were analyzed using CFD(Computational Fluid Dynamic) technique.

The shroud at high speed is modeled as an elliptic wing in order to construct a momentum theory method to investigate the aerodynamic characteristics of ducted tail rotor in hover and forward flight.

The flow field characteristic of a helicopter ducted tail rotor in hovering were analyzed using CFD method in this paper.

Numerical methods for hypersonic flow with chemical non-equilibrium reactions on the unstructured grid are used to analyze the drag induction of channel-configurations.