Numerical simulations of the civil aviation aircraft wings with or without wingtip vortex diffuser

The formation and dissipation numerical simulations of wingtip vortex of aircraft wing with and without wingtip vortex diffuser were proceeded with software—ANSYS FLUENT based on Realizable k-eturbulence eddy viscosity models. The effect of wingtip vortex diffuser on wake vortex was studied. Compared with the clean wing on the static pressure coefficient,axial component of vorticity,velocity vector,wingtip vortex diffuser can not only change the static pressure coefficient of the wingtip and increase the lift ratio,but also prevent the high-pressure airstream of the lower surface from flowing to the upper surface,therefore resulting in the wingtip vortex being divided into four vortexes in different directions. In the process of flowing downstream,the energy of the four vortexes is dissipated through interaction with each other,eventually reducing the scale of the wake vortex.