Research On The Characteristic Of The Eccentric Vortex In The Fanwing

Eccentric vortex existing in the flowfield of the fanwing aircraft is an important factor for thefanwing aircraft getting high lift. In this thesis, the numerical method has been used to analyze thecharacters of the fanwing flowfield and the formation of the eccentric vortex. Influence of theeccentric vortex on the aerodynamic characteristics of the fanwing is preliminary studied. Meanwhile,the effect of the design parameters on the eccentric vortex has been analyzed. The study contents areas follows:First, the domestic and overseas research results on the eccentric vortex inside the fanwing areintroduced, and it is pointed out that the CFD method is necessary for research of the fanwingflowfield and characteristics of the eccentric vortex. Secondly, a numerical simulation method basedon the unsteady Navier-Stokes equations for the fanwing flowfield has been established. In thismethod, sliding mesh, RNG k turbulence model, and structured mesh have been used. Then, thesimulation of the fanwing flowfield is conducted by the method and the validation of the method isdemonstrated by comparing the calculated results with corresponding numerical results andexperimental data. Simultaneously, the process of the formation of the eccentric vortex has beennumerically simulated and the mechanism has been analyzed. On the basis, effect of eccentric vortexon aerodynamics of fanwing and energy dissipation of the eccentric vortex has been investigated.Finally basing upon the above numerical simulation method, the effect of design parameters of thefanwing on the eccentric vortex has been conducted. Some meaningful results are obtained.