The Analysis Of Aerodynamic Performance Of The Flap And Slot On The Leading Edge Of Fan-wing

By the rotation of cross flow fan in the leading edge of fan-wing, the thrust and high lift force was obtained. The lift and thrust have strong coupling relationship, because of the lift and thrust both dependent on the cross flow fan spin which generate eccentric vortex in the period of the wing arc. Separate change lift or thrust becomes very difficult, reduces the fan-wing flight vehicle maneuverability. Through analysis in various geometric parameters of fan-wing, the front opening corner had biggest influence among all the parameters. The flap or slot on the leading edge of the Fan-wing was used to change the size of the front opening corner.By this way, the direction and flow of the air into the cross flow fan can be changed, so as to change lift and thrust to achieve part of decoupling. Based on the two-dimensional unsteady numerical simulations, the aerodynamic characteristics analysis of the flap and slot on the leading edge of fan-wing was done. The concrete research content was as follows:Firstly, the research status at home and abroad of aerodynamic performance analysis about fan-wing was introduced in this article. Secondly, based on Navier-Stokes equations, the numerical simulation method, which adopted the technology of the mesh partition, sliding mesh and k -e RNG turbulent model, was established to analysis aerodynamic performance of fan-wing. Thirdly, after numerical simulation for the front opening corner, frontal arc wall clearance and flap installation angle, which were geometric parameters that could influence the design of flap and slot in the leading edge of fan-wing, the benchmark model was established and the flap and slot size was designed. Then, the flap on the leading edge of fan-wing was compared with the aerodynamic performance influence of the benchmark model and the aerodynamic performance influence of different number of flap and install angle of fan-wing were analyzed. Finally, the slot on the leading edge of fan-wing was compared with the aerodynamic performance influence of the benchmark model, and the aerodynamic performance influence of different number/size/install position of slot to fan-wing was analyzed. Some meaningful results are obtained.