Application of the Vortex Lattice CFD Method to Obtaining Unsteady Aerodynamic Predictions About Wing/Fuselage/Pylon/Store Configuration Including Store Separation

摘要

The Unsteady Vortex Lattice Method (UVLM) was used to predict the geometry of the wake and the aerodynamics loads on the Wing/Fuselage/Pylon/Store (W/F/P/S) configuration in an incompressible flow. The main emphasis was placed on a practical and cost effective engineering solution of the complex problem with a reasonable computational efficiency allowing the computer code to run on personal computers. The mutual interaction between the configuration and the wake flow was studied. Due to the interaction between the configuration and its wake, a new longitudinal vortex develops between the wing-tip and the wing-fuselage junction. It was shown that the wake development influences the unsteady aerodynamic forces acting both on the wing and the external store. Computed flow field simulations were presented for various angle of attack conditions. The effect of the pylon/store location on the wing aerodynamic coefficients were investigated. The external store separation under the influence of the wake rollup was modeled by considering the full mutual interaction between the store and the W/F/P system. The results show that the method is capable of simulating the unsteady aerodynamic interference between the moving store and the flow around the W/F/P configuration.