Numerical simulation of trailed vortex alleviation through chipped wingtip shapes

다국어 초록 (Multilingual Abstract)

The shedding of strong vortices generated during take-off and landing poses serious hazards for the following aircraft. To circumventthe vortex wake hazard, a chipped wingtip shape was suggested, and a series of numerical simulations were conducted to verify the conceptualvalidity of such shape. Numerical simulation was performed by using the incompressible Navier–Stokes solverwiththe pressurebasedsemi-implicit method for pressure linked equations algorithm. The Reynolds stressmodel was employed to evaluatethe turbulenceeffects.The trailed vortices ofthe chipped wingtip shapeswerefound to be more dissipative than those of thebaseline wingtip shape. Thecounter-rotating vortices produced by the chipped wingtip shape can weaken the primary wingtip vortex strength in the far field. Regardlessof the slightly increasing the drag, the chipped wingtip shape can successfully mitigate the tangential velocity of the vortices. Thesetypes of wingtip shapes had various design parameters, such as the aspect ratio, spacing, and area of each chip. Systematic numericalsimulations were conducted to evaluate the effect of these parameters.According to the parametric study results, the aspect ratio wassensitive to the increase in the drag coefficient, and the area was susceptible to the moment coefficient. Evidently, a trade-off relationshipexisted between the tangential velocity reduction and the drag increase.

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