Research On Aerodynamics Characters Of The Vectored Thrust Ducted Propeller

Vectored Thrust Ducted Propeller (VTDP) has been promising to be equipped on compound helicopters because it is proved to be an effective way in enhancing the maximum velocity and handling performance of the compound helicopters. However, due to the complexity of the aerodynamics of the VTDP, the theory of the VTDP is far from complete. This thesis is aimed to resolving the aerodynamic problem of the VTDP by both experimental investigation and CFD (Computational Fluid Dynamics) technique.In chapter 2, the experiment on aerodynamics of the model VTDP and the important results are presented in detail. A test VTDP model was developed and the aerodynamics forces and moments were measured in axial flow condition to investigate the aerodynamic characteristics and the influences of design parameters.In chapter 3,a numerical simulation model is developed firstly for the ducted fan system which is the key step for further research into the VTDP. The capability of this numerical model is validated by the comparison between the calculation results and available experimental data. Based on the CFD model of ducted fan developed, a numerical model of the model VTDP is developed and the capability of this numerical model is demonstrated by the comparison between the calculation and the experimental data in chapter 2. Finally, the numerical model of the VTDP is extended to analysis the aerodynamic characteristics of VTDP in the oblique flow condition as well as the interactions among the components of the VTDP.