Two-dimensional Aerodynamics Characteristics Study on Lift-fan Aircraft Openings in Flying Wing Configuration

The lift-fan aircraft in flying wing configuration not only can be capable of short distance/vertical takeoff and landing( S /VTOL),but also have the aerodynamics advantages of the flying wing. In order to obtain the effect laws of the opening on the aerodynamic characteristics of the wing,the aerodynamics performance of the longitudinal center section of wing opening is studied by the aerodynamic simulation in horizontal flight. Moreover,the characteristics of lift coefficient,drag coefficient and moment coefficient changing with the change of flow velocity and angle of attack are also analyzed. The study shows that under the same angle of attack,with the increase of flow velocity,drag coefficient and moment coefficient are risen. Under the same flow velocity,with the increase of angle of attack,the lift coefficient is increased,the drag coefficient is decreased first and then increased,the moment coefficient is decreased,and always produce nose-down moment. The study results provide a basis for the further optimization of the opening position and shape.