Abstract
Aircraft icing has influence on the preliminary safety and performance evaluation of airplane. In this paper, based on different ice shapes (none, rime, mixed), the aerodynamic models of airfoil are established to analyze. Various lift/drag characteristics are obtained by numerical simulation using computational fluid dynamics (CFD) under different icing conditions. Navier-Stokes (N-S) equation and Spalart-Allmaras (S-A) turbulence model are adopted. The results show: 1. It’s obvious that lift-drag characteristics are different under various ice shapes. The lift coefficient (α=0° ∼7°): CL none>CL rime>CL mixed, the drag coefficient (α=0° ∼7°): CD none<CD rime<CD mixed. 2. At the same angle of attack (α=6°), lift/drag characteristics in the condition of different ice shapes are different. The pressure gradient at the leading edge is ▽p none>Vp rime>▽p mixed, which has important effect on the speed of airstream flow and the flow separation at the front zone of airfoil.
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